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Search Results: 1 - 10 of 302190 matches for " Caragana korshinskii<br>AM真菌 "
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Diversity and spatial distribution of arbuscular mycorrhizal fungi of Caragana korshinskii in the Loess Plateau

HE Xue-Li,ZHAO Li-Li,YANG Hong-Yu,

生态学报 , 2006,
Abstract: The diversity and spatial distributions of arbuscular mycorrhizal fungi of Caragana korshinskii were investigated in four natural environments of the Loess Plateau, such as Ansai, Suide, Hengshan and Yulin of Shaanxi province. There are 4 genera and 11 species of AM fungi were isolated from the soil samples under the Caragana korshinskii, 3 species of them belong to Acaulospora, 1 species belong to Gigasporn, 5 species belong to Glomus and 2 species belong to Sctaellospora. The result showed that the G. constrictum and G. mosseae are dominant species; the different species of AM fungi appeared in the different ecological environments, such as A. spinosa and S. calospora only occur in Suide site, A. lacunosa only occurs in Hengshan site, Gi. decipiens and S. erythropa only occur in Ansai site. Different sample sites had significantly affected on spore density and the percentage of colonization of vesicle and arbuscular of AM fungi. The highest value of spore density and vesicular colonization was in Suide, and the highest arbuscular colonization was in Yulin. Soil depth had a significant effect on spore density in four sites, the highest spore density existed in the 10 - 20cm soil layer; the highest percentage of colonization of AM fungi occurred at the 0 - 10cm or 20 - 30cm soil layer. Spore density was positively correlated with vesicular colonization and negatively correlated with arbuscular colonization. Spore density was also negatively correlated with soil organic matter, available P, available K and Cl^- content. Vesicular colonization had a positive correlation with soil pH and a negative correlation with soil moisture, available K and Cl^- content.
Ecological research on arbuscular mycorrhizal fungi from the rhizosphere of Caragana korshinskii in the Loess Plateau

HE Xue-Li,ZHAO Li-Li,YANG Hong-Yu,

中国生态农业学报 , 2007,
Abstract: 对陕西省延安、绥德、横山和榆林4个自然生境下柠条根际AM真菌空间分布和土壤成分进行测定分析。结果表明,AM真菌泡囊定殖率及孢子密度与样地生态条件密切相关,泡囊定殖率和孢子密度在绥德最高,丛枝定殖率在榆林最高。采样深度对孢子密度有显著影响,最大孢子密度发生在10~20cm土层,而AM真菌定殖率在0~10cm或20~30cm土层有最大值。孢子密度与泡囊定殖率呈正相关,与丛枝定殖率呈负相关。孢子密度与土壤有机质、速效磷、速效钾和Cl-含量呈负相关,泡囊定殖率与土壤pH呈正相关,而与土壤湿度、速效钾和Cl-含量呈负相关。土样中AM真菌多为球囊霉属(Glomus)种类,也有少数无梗囊霉属(Acaulospora)和巨孢囊霉属(Scutellospora)种类。建议孢子密度和泡囊定殖率可作为检测土壤环境状况的指标。
Effects of AM fungi on the growth and drought resistance of Caragana korshinskii under water stress conditions
水分胁迫下AM真菌对柠条锦鸡儿(Caragana korshinskii)生长和抗旱性的影响

HE Xue-Li,LIU Ti,AN Xiu-Juan,ZHAO Li-Li,

生态学报 , 2009,
Abstract: 利用盆栽实验研究了水分胁迫条件下AM真菌对柠条锦鸡儿(Caragana korshinskii)生长和抗旱性的影响.在土壤相对含水量为80%、60%和40%条件下,分别接种摩西球囊霉(Glomus mosseae)和柠条锦鸡儿根际土著菌,结果表明,水分胁迫对AM真菌的接种效果有显著影响.不同水分条件下,接种AM真菌显著提高了宿主植物根系菌根侵染率.土壤相对含水量为40%~60%时,接种株的株高、茎粗、生物干重和叶片保水力明显高于不接种株;接种AM真菌提高了植株对土壤有效N和有效P的利用率,增加了植株全P、叶片叶绿素和可溶性糖含量以及SOD、POD、CAT等保护酶活性.土壤相对含水量为40%时,叶片MDA含量明显下降.水分胁迫条件下,以接种柠条锦鸡儿根际土著菌的效果最佳.AM真菌增强宿主植物的抗旱性可能源于促进宿主植物根系对土壤水分和矿质元素吸收的直接作用和改善植物体内生理代谢活动、提高保护酶活性的间接作用.
Diversity of arbuscular mycorrhizal fungi in the rhizosphere of Caragana korshinskii Kom. in desert zone

HE Xueli,CHEN Zheng,GUO Huijuan,CHEN Cheng,

生态学报 , 2012,
Abstract: Arbuscular mycorrhizal(AM) fungi play an important role in maintaining the ecosystem function and plant biodiversity in arid lands,and serving as the indispensible factor in the restoration and reestablishment of vegetation.AM fungi are widely distributed in global terrestrial ecosystems and play a bridge role in the cycle of nutrient material between plant and soil.Many studies on the survey of AM fungi resources,ecological distribution,symbiotic relationship and AM fungi related with different environmental factors had been conducted now.Caragana korshinskii Kom.was widely used for vegetation rehabilitation for its high ecological and economic values in China.In addition,it has certain features such as the ability that easy to sprout and forest,rooted deep and the strong resistance to stress.And it also has nodule formation so that can help restore degraded land by atmospheric nitrogen fixation and improve the soil structure and ecological environment.In order to elucidate the diversity and distribution of AM fungi associated with the major desert plant Caragana korshinskii Kom.in desert zone.In July 2010,the soil samples were collected from a depth of 50cm in the rhizosphere of Caragana korshinskii Kom.and were divided into five depth intervals: 0—10,10—20,20—30,30—40,40—50cm in three sampling sites in the desert zone of Hebei and Inner Mongolia province north China including Duolun Lake,Hei Chengzi and Er Yangdian.The annual precipitation,average altitude and coordinate of Duolun Lake were 384.5mm,1312m and N42°11′601″E116°36′870″respectively;of Hei Chengzi were 250-350mm,1321m and N42°09′817″,E115°56′107″;of Er Yangdian were 426mm,1386m and N41°51′095″,E115°47′657″.In this study,24 AM fungal species from four genera were isolated in three sampling sites.In these species,16 species belonged to Glomus,five to Acaulospora,two to Scutellospora and one to Diversispora.Glomus was the dominant genus and Acaulospora was the subdominant genus in the three sampling sites.G.reticulatum was the dominate species in Duolun Lake and Hei Chengzi,and was the subdominant species in Er Yangdian;G.melanosporum was the dominate species in Hei Chengzi and Er Yangdian,and was the subdominant species in Duolun Lake.Spore density of AM fungi in Er Yangdian was the highest,and had no obvious differences between Duolun Lake and Hei Chengzi.Spore density had a significant positive correlation with the available N,soil organic carbon and available P,and the available N was the highest.The results showed that the diversity of AM fungal species was rich in the rhizosphere of Caragana korshinskii Kom.,and they had significant spatial distribution dynamics.The paper described the diversity and distribution of AM fungi in the rhizosphere of Caragana korshinskii Kom.,so that it will provide great help to ecosystem reestablishment,isolation of dominate species and sustainable economic development in desert zone.
Eco-physiological mechanisms of Caragana korshinskii Kom. adaptation to extreme drought stress: Leaf abscission and maintaining stem chloroplast integrity

DangHui Xu,XiangWen Fang,ZhenJun Bin,Gang Wang,PeiXi Su,

寒旱区科学 , 2012,
Abstract: In order to study the eco-physiological mechanisms of C. korshinskii adaptation to extreme drought stress, we investigated the variations of water content in soil, leaves, and stems, the chlorophyll a and b and the carotenoid content in leaves and stems, as well as changes of chloroplast ultrastructure in 2-year-old C. korshinskii specimens during a progressive soil drought process (by ceasing watering until all leaves were shed) and a subsequent rehydration process. During the dehydration process, the chlorophyll a and b and carotenoid contents in the leaves decreased, as did the carotenoid content in the stems. During the 4-day rehydration process, the chlorophyll a and b and carotenoid contents in the leaves and stems increased and gradually returned to normal levels. During ongoing drought stress, chloroplasts in the leaves broke away from cell walls and appeared in the center of cells. Under severe drought stress, the mesophyll ultrastructure and chloroplast configuration in leaves were irreversibly disturbed, as manifested by the inner and outer membranes being destroyed; the thylakoid system disintegrated, the starch grain disappeared, and parts of cell tissue were dismantled into debris. However, the mesophyll ultrastructure and chloroplast configuration in the stems remained complete. This indicates that C. korshinskii utilizes leaf abscission to reduce the surface area to avoid damage from extreme drought stress, and maintains chloroplast integrity and a considerable amount of chlorophyll to enable a rapid recovery of photosynthesis under the rehydration process.
The relationships between △T_(max) and meteorological factors and determining a suitable time step in calculating taproot sap flow of Caragana korshinskii

DANG Hongzhong,ZHOU Zefu,ZHANG Jinsong,ZHAO Yuseng,

生态学报 , 2010,
Abstract: The △T_(max), defined as the maximum of temperature difference between the two probes which implant adjacently in the upper and lower sap wood of the tree stem or root, is an important parameter for measuring sap flow by the Granier technique. The key for computing △T_(max) is determining a time step. The sap flow in the taproot of Caragana korshinskii from April to October in 2008 was measured continually and the environmental factors were recorded simultaneously in this study, and data from 30 sunny days were chosen for analysis. The results showed that △T_(max) was observed most frequently in the period from 22:00 to 6:00, and was higher in the 4 hours prior to and after midnight(with a frequency of 52.63%). The highest value occured at 0:00. The time of occurrence of △T_(max) was not significantly correlated with environmental factors and the driving force for sap flow was the water potential difference between leaf and root rather than the environmental factors. The △T_(min), defined as the minimum of temperature difference between the two probes, occurred most frequently between 10:00 and 16:00, with the highest value at 14:00. There was a local minimum in △T_(min) at 14:00 when the solar radiation and the potential evapotranspiration (PY_(max) and ET_(0max), respectively)achieved their peak values. This was attributed to stomata regulation on sap flow at noon. Solar radiation was a key environmental factor triggering stomata regulation at noon. The suitable time step in F_s' computing by Granier technique is one week.
Hydraulic architecture of three Caragana species and its relationship with environmental factors in different habitats of the Inner Mongolian Plateau, China

Li Jing,Gao Yubao,Zheng Zhirong,Gao Zenglu,

生态学报 , 2007,
Abstract: Hydraulic architecture and its relationship with environmental factors were studied in three Caragana species, namely, Caragana microphylla Lam., C. davazamcii Sancz and C. korshinskii Kom, which were found in different habitats of the Inner Mongolian Plateau, China. The improved flushing method was used in situ on one-year-old twigs for comparing the hydraulic efficiency and the regulating abilities of these three species as well as their mechanisms of regulating water transport to cope with variable environments. The relationship between hydraulic architecture and air temperature followed a linear function with negative slope, whereas the relationships between these parameters with atmospheric humidity were positive. Comparing the hydraulic efficiency among the three seasons, a descending order was given as summer>spring>autumn. In the same season, the hydraulic efficiency of C. korshinskii was higher than that of C. davazamcii, which was in turn higher than that of C. microphylla. It can be concluded from the range of Ks and the slope of two linear functions that there were significant differences in the sensitivity of specific conductivity to environmental factors, both among species and among seasons, with a descending order as summer>spring>autumn. In the same season, C. korshinskii was the most sensitive to the changes of environment, and the sensitivity of C. davazamcii was higher than that of C. microphylla. The results also supported the view that the reduction of hydraulic efficiency because of the embolism in xylem could benefit the plants subjected to water deficit by means of limiting water loss.
Insect Infestation and Its Effect on Seed Fate of Caragana korshinskii

CHEN Ying-wu,LI Xin-rong,ZHANG Jing-guang,TAN Hui-juan,ZHANG Zhi-shan,JIA Xiao-hong,

中国沙漠 , 2006,
Abstract: Insect infestation and its effects on seed fate of Caragana korshinskii Kom were studied in southeast edge of the Tengger Desert in 2004.The results indicate that the seed germination rate is significantly affected by insect infestation.The insect-infested seeds show a lower germination rate than that of non-infested or die rapidly even after germination.On the average,69.7% of the total seeds are infested by insects,which is mainly involved with Kytorrhinus immxitus Motschulsky,Bruchophagus neocaragae Liao,Brchophagus philorobinae Sphov,and Etiella zinckenella Treitschke.The development and growth of seeds can also be effected by the insect parasitism through its size swelled by Kytorrhinus immxitus Motschulsky or shrunk by Etiella zinckenella Treitschke,Bruchophagus neocaragae Liao,and Bruchophagus philorobinae Sphov.Comparing with non-infested seeds,57.64% loss in weight is caused by Kytorrhinus immxitus, Etiella zinckenella and Bruchophagus sp.accounts for 49.13%,39.30% and 39.30%,respectively.Based on this study,it can be concluded that insect infestation is one of the main factors for regeneration of Caragana korshinskii through its effects on seeds fate.
Rainfall interception by sand-stabilizing shrubs related to crown structure

ZhiShan Zhang,XinRong Li,XueJun Dong,XiaoHong Ji,MingZhu He,HuiJuan Tan,

寒旱区科学 , 2009,
Abstract: On the edge of the Tengger Desert in northern China, revegetation has changed the landscape from moving dunes to stabilized dunes covered by shrubs, which further modifies the pattern of rainfall redistribution. To study rainfall interception loss by shrubs and its relationship to rainfall properties and crown structure, throughfalls passing through crowns of Artemisia ordosicaKrash. and Caragana korshinskiiKom. were measured using nine PVC cups under the canopy of each of the two shrubs during 73 rain events over a three-year period, with total rainfall of 260.9 mm. Interception losses of gross rainfall by A. ordosica and C. korshinskii account for 15% and 27% of the total on a crown area basis, and 6% and 11% on a ground area basis, respectively. Individual throughfall (T) and interception (I) were significantly related to rainfall amount (Pg), duration (D), and intensity (R). Ratios of throughfall to rainfall (T/Pg) and interception to rainfall (I/Pg) were not only significantly related to Pg, D, and R, but also to shrub species, and interactions of species with crown volume (Cv) and leaf area index (LAI). Under most rain events, interceptions by C. korshinskii with greater Cv and LAI were significantly higher than those by A. ordosica, and more rainfall interception occurred at locations closer to the stems of the two shrubs. For C. korshinskii, I/Pg, had a significant positive linear relation with Cv and LAI, while T/Pg had a significant negative linear relation with them. Cv has a greater influence on T/Pg and I/Pgthan does LAI. Using a regression method, canopy water storage capacities are estimated to be 0.52 and 0.68 mm, and free throughfall coefficient to be 0.62 and 0.47 for A. ordosicaand C. korshinskii, respectively.
Root Distribution of Two Species of Caragana in Alpine Sandy Land

- , 2016, DOI: 10.3969/j.issn.1001-7461.2016.02.21
Abstract: 中间锦鸡儿和柠条锦鸡儿是共和盆地沙丘造林的主要树种。通过剖面法比较了2种锦鸡儿10年生人工林的不同级别的根系分布特征。结果表明:2种锦鸡儿均为深根系植物,深度达到1 m。中间锦鸡儿的根系生物量主要分布在0~60 cm。其中,粗根、中根和细根分别主要分布在0~30、0~60 cm和0~60 cm。然而,它的3个不同径级根系的长度分别主要分布在0~30、0~50 cm和0~60 cm。柠条锦鸡儿的根系生物量主要分布在0~90 cm。其中,粗根、中根和细根分别主要分布在0~60、0~60 cm和0~90 cm。然而,它的3个不同径级根系的长度分别主要分布在0~60、0~60 cm和0~70 cm。因此,中间锦鸡儿的根系相对较浅,适宜吸收降雨补充的浅层和中层土壤水分。柠条锦鸡儿的根系向更深的土壤中生长,吸收深层土壤水分。这反映了2种锦鸡儿对高寒沙地半干旱气候的适应差异。
Caragana intermedia and C.korshinskii are tow main shrubs used in the re-vegetation on sand dunes in Gonghe Basin.Root distribution characteristics of different types of two Caragana species were studied by profile method.The results showed that 10-years-old plantation of two species were deep-rooted,which was as deep as 1 m.The fresh and dry mass of C.intermedia distributed mainly in 0-60 cm,and the coarse roots,medium roots and fine roots distributed in 0-30,0-40 and 0-60 cm depths,respectively.However,the length of different root types distributed in 0-30,0-50 and 0-60 cm,respectively.The fresh and dry mass of C.korshinskii distributes mainly in 0-90 cm depth,and the coarse roots,medium roots and fine roots distributed in 0-60,0-60.and 0-90 cm,respectively.However,the length of different types of C.korshinskii roots distributed in 0-60,0-60 and 0-70 cm.Therefore,the relative shallower root system of C.inermedia was suitable to use soil water in shallow and medium depth;the root system of C.konshinskii grew to deeper depth to use deeper soil water,indicating the differences in the adaptation characteristics of two Caragana shrubs to semi-arid climate in alpine sandy land
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