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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.
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。
Transpiration characters of Caragana korshinskii and its influence factors

PAN Zhan-Bing,JIANG Qi,GUO Yong-Zhong,WEN Xue-Fei,ZUO Zhong,
,蒋 齐,郭永忠,温学飞,左 忠

中国生态农业学报 , 2006,
Abstract: The results of the study on the transpiration characters of Caragana korshinskii and its influence factors show that the daily variation of transpiration of Caragana korshinskii is double peaks which appear at 11:00 and 15:00, the average of daily transpiration rate is 4.51mmol/m2·s, and the major environmental factors affecting transpiration rate are the air temperature, the relative humidity of atmosphere and the soil water respectively.
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.
Effect of Cellulose on Fermentation of Caragana korshinskii Powder as Substrate during Composting in Static State

- , 2015, DOI: 10.7606/j.issn.1004-1389.2015.07.025
Abstract: 为了加快柠条粉发酵速度,缩短柠条粉发酵时间,以纤维素酶为发酵助剂,设置0.125、0.25、0.5、1.25、2.5、0 kg·m-3(CK)6个处理,通过添加纤维素酶,观测不同剂量纤维素酶添加处理下柠条粉发酵物的温度、理化性状、微生物种群数量、基质酶活性、发芽指数等指标的变化。结果表明:添加纤维素酶能够加快柠条粉发酵速度,柠条粉发酵60 d时,添加量为0.5 kg·m-3处理的发芽指数达到81.05%、添加量为1.25 kg·m-3处理的发芽指数达到83.45%;纤维素酶剂量增加能够提高发酵物电导率和柠条发酵物的养分释放量,增加速效氮质量分数;多酚氧化酶活性与纤维素酶使用剂量线性相关系数为0.903。当纤维素酶添加量为0.5 kg·m-3和1.25 kg·m-3时,柠条粉发酵60 d已达到腐熟及无毒害标准。可见,适当剂量纤维素酶的使用对柠条粉发酵物厌氧发酵具有促进作用,可明显加快柠条粉发酵速度,较之前发酵时间缩短1/3,建议使用0.5 kg·m-3纤维素酶制剂作为柠条粉发酵助剂用量。
In order to accelerate Caragana korshinskii powder fermentation and shorten fermentation time of Caragana korshinskii powder.Cellulose enzyme was used to accelerate fermentation of Caragana korshinskii powder,six treatments such as 0.125,0.25,0.5,1.25,2.5,0 kg·m-3 (CK) were done to observe temperature,physical and chemical properties,microbial populations,substrate enzyme activity,germination index and other indicators of change in Caragana korshinskii yeast powder under different doses of cellulase.The results showed that adding cellulose enzyme could speed up the fermentation of Caragana korshinskii powder,Caragana korshinskii powder yeast was 60 days,germination index of treatment reached 81.05% afer adding 0.5 kg·m-3 while adding 1.25 kg·m-3 germination index of treatment reached 83.45%;different doses of cellulose enzyme could improve the yeast conductivity,Caragana korshinskii yeast and nutrient release quantity, and increase the available nitrogen mass fraction;polyphenol oxidase activity and cellulose enzyme dosage for the linear correlation coefficient were 0.903.When cellulase amount was 0.5 kg·m-3 and 1.25 kg·m-3,powder yeast of Caragana korshinskii had reached 60 days rotten and specialties of the standard.So the appropriate dosage of cellulose enzyme could promote the anaerobic fermentation of Caragana korshinskii powder yeast,could also obviously accelerated the Caragana korshinskii powder fermentation,fermentation time was 1/3 shorter than reasonable use of Caragana korshinskii resources.We recommende to use cellulose enzyme preparation powder 0.5 kg·m-3 as agent dosage of Caragana korshinskii fermentation.
Molecular Diversity of Arbuscular Mycorrhizal Fungi in a Chronosequence of Caragana korshinskii Plantation

LIU Yong-jun,FENG Hu-yuan,

中国沙漠 , 2009,
Abstract: We used PCR-DGGE, DNA cloning and sequencing techniques to study the community structure and diversity of arbuscular mycorrhizal fungi (AMF) in a chronosequence of Caragana korshinskii plantation in gully region of the Loess Plateau. Phylogenetic analysis of all DNA sequences revealed four sequence groups, of which all grouped in the genus of Glomus. The four sequence groups showed high similarity to Genbank sequences of G. intraradices, G. fasciculatum, Glo18 and G. sp. respectively. Our results indicated an extremely low diversity of AMF presented in the C. korshinskii roots in a sampling time point. All of the four sequence groups presented in 5, 13 and 20-year sites, but G. sp. were not distinctly detected in 42-year site. It suggested AMF community composition in a chronosequence of C. korshinskii plantations was stable, and implicated the restoration of AMF community was not successful with the succession of C. korshinskii plantations. The little edaphic variation and the positive feedback relationship between AMF and plant communities in C. korshinskii plantation maybe result in such a phenomenon.
Free amino acid content in different tissues of Caragana korshinskii following all shoot removal

ZHANG Hain,FANG Xiangwen,JIANG Zhirong,FENG Yanhao,

生态学报 , 2011,
Abstract: Caragana korshinskii K.,a dominant member of desert flora in north-western China,is often subjected to aboveground shoot damage,such as grazing,clipping,trampling or wind throw,but as a resprouter shrub,it has a strong ability to regrow following damage and is very successful in its rapid recovery.This sprouting growth plays an important role in maintaining and regenerating the population and contributes to controlling desertification in this area.However,the mechanisms underlying the rapid growth have not ...
Stemflow of Caragana korshinskii and its Infiltration and Redistribution in Desert Environment

WANG Zheng-ning,WANG Xin-ping,

中国沙漠 , 2010,
Abstract: 运用铝箔收集法测定了荒漠灌木柠条(Caragana korshinskii Kom.)树干茎流;利用时域反射仪连续测量土壤剖面水分含量,分析树干茎流影响下柠条根际区水分入渗与再分配过程。结果表明,柠条灌丛产生树干茎流需要2.2 mm的前期降雨量,树干茎流占降雨量的7.9%,平均汇流率是89.8。土壤表层含水率对降雨过程响应明显; 当降雨量达到6 mm时,树干茎流有利于增加根际区土壤水分增量,补充深层土壤水分,对荒漠植被在干旱条件下存活起着重要作用。
Stem Sap Flow of Caragana korshinskii and Its Influence Factors in a Revegetated Desert Area

HUANG Lei,ZHANG Zhi-shan,ZHOU Xiao-kun,

中国沙漠 , 2011,
Abstract: Stem sap flows of 18-year-old Caragana korshinskii plants were monitored continuously with Dynamax stem flow recorder for the entire growing season under nature conditions in a revegetated desert area.Environmental factors such as solar radiation,air temperatures,relative humidity,wind speed,and precipitation were measured meanwhile with eddy correlation system.Results show that the curves of stem sap flow rate in the whole growing season are obviously single-peak.Sap flow usually starts at 00:00 and increa...
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