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Search Results: 1 - 10 of 104197 matches for " 乔玉辉 "
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Simulation study on the effects of irrigation on soil salt and saline water exploration
灌溉对土壤盐分的影响及微咸水利用的模拟研究

QIAO Yu Hui,

生态学报 , 2003,
Abstract: Based on the land use analysis model of PS123, the simulation of soil salts effects on crop growth is integrated in PS123 model con sidering osmotic stress of the salt effects on water uptake and production. This salt integrated crop model is more suitable to be used in salinity land and wa ter irrigation simulation. This model is calibrated with field experiments condu cted at Hebei Quzhou Experimental Station of China Agricultural University. But there are still some problems to be solved such as the simu...
灌溉对土壤盐分的影响及微咸水利用的模拟研究
,宇振荣?
生态学报 , 2003,
Abstract: 在土地利用分析模型ps123的基础上,以土壤盐分主要影响作物水分吸收为突破口,将盐分对作物生长的影响结合到模型中,以使模型更加适合于盐渍化土地和微咸水灌溉的使用。并运用田间试验对模型进行了验证,模拟结果较好。利用模型对微咸水不同的灌溉方案对土壤盐分的影响进行分析,提出了合理的灌溉方案。盐渍化地区地下水位埋深应控制在2.0~2.5m以下,微咸水灌溉宜采用少次多量的措施进行较大定额灌溉,且不能连续灌溉。
玉米秸秆生物炭对溶液体系中不同重金属离子的吸附特性
Adsorption of different heavy metal ions in solution system by corn stalk-based biochar

张小玲,,李花粉
- , 2018,
Abstract: 为探究在废水处理中针对不同重金属吸附特征选择合适的生物炭修复方案,以玉米秸秆为原料,在300和500℃下热裂解得到2种生物炭,通过试验模拟研究生物炭在单组分溶液体系和多种重金属离子的混合溶液体系中,对不同重金属离子的吸附能力,并用等温吸附模型对试验结果进行拟合。研究结果表明:1)对于同种重金属而言,500℃下得到的生物炭的吸附能力更强;2)对于同种吸附材料,单组分与多种重金属离子的混合溶液中对重金属离子饱和吸附量的顺序均为:Ni2+ < Zn2+ < Cd2+ < Pb2+ < Cu2+;3)但在多种重金属离子的混合溶液体系中金属离子浓度较高条件下,离子之间的相互作用影响生物炭吸附能力;同时Cu2+和Pb2+ 2种离子具有较高的吸附量,竞争力更强。
The adsorption ability of different heavy metal ions by corn stalk-based biochars of 300 and 500℃,respectively was investigated in solution system with single and multiple ions.The experimental data were fitted by isothermal adsorption model.The results showed that 500℃ biochar has higher adsorption capacity than that of 300℃ biochar.For the same biochar,the order of the saturated adsorption capacity of biochar in single ion solution is Ni2+ < Zn2+ < Cd2+ < Pb2+ < Cu2+.However,under the condition of high concentration of metal ions in heterogeneous solution system,the interaction between ions has a great influence on the adsorption capacity of biochar.Meanwhile,both biochars show higher adsorption capacity to Cu2+ and Pb2+.In conclusion,these results provide references for choosing suitable biochar remediation schemes for different heavy metal adsorption characteristics in practical applications such as wastewater treatment.
Secondary succession of earthworm population in high production agro-ecosystem in North China
华北高产农田生态系统中蚯蚓种群次生演替规律

QIAO Yu-Hui,

生态学报 , 2004,
Abstract: The study was conducted in Huantai County Shandong Province in North China to study the secondary succession of earthworm population under low and high soil fertility in agro-ecosystem. The result shows that seven species were found both in two agro-ecosystems, but the earthworm population density and composition are different, the average earthworm population in the high fertility soil is relatively abundance, the population density is 83.83 in./m~2. Among the seven earthworm species, Aporrectae trapezoids is the dominant species. While in the low fertility soil, the population density is 40.18 ind./m~2 and Drawida gisti is the dominant species. Comparing the density of each earthworm species in the two kinds of soil fertility agro-ecosystems, the density of Aporrectae trapezoids and Amynthas hupeiensis is significantly higher in the high fertility soil than that in the low fertility soil, while the difference of other five species is not obvious. This result shows that with the succession of the soil fertility, the earthworm also has a process of succession; the abundance species in the low fertility agro-ecosystem Drawida gisti is gradually substituted by Aporrectae trapezoids in the high fertility agro-ecosystem. One-year experiment was also conducted to study the impact of the organic input on earthworm population and succession. The result shows that with the increase of the organic input, the earthworm population density is increasing, the earthworm density of the treatments has the following ascending trend: Chemical fertilizer
冬小麦干物质在各器官中的累积和分配规律研究
,宇振荣,pm,driessen
应用生态学报 , 2002,
Abstract: 为修正冬小麦生长模型中的干物质分配,通过田间试验,对冬小麦干物质累积和在不同器官中的分配进行了描述.并且在此基础上结合文献资料,对冬小麦光合产物在各器官中的分配和转移系数的计算方法进行了探讨,分析了两者随相对发育阶段(rds)的变化规律,并建立了函数表.同时运用试验资料进行了实地验证,取得较好的效果.
华北盐渍化改造区蚯蚓种群次生演替与生产投入的关系——以河北省曲周试区为例
,吴文良,徐芹,陈锴
应用生态学报 , 2001,
Abstract: 通过对河北省曲周县盐渍化改造区农田生态系统中蚯蚓物种多样性分析,发现蚯蚓种群的次生演替与农田肥料投入有很好的相关性,合理的投入特别是有机肥的投入可以加速农田生态系统中生态演替;该地区蚯蚓种群分布总的趋势是:第2代试区>第1代试区>第3代试区>原貌区;不同土地利用方式蚯蚓的分布和数量各不相同,菜地>农田>边缘地和果园.
土壤微生物对除草剂乙草胺污染的响应和指示
郭兴华,,赵 晶,孙振钧
中国生态农业学报 , 2009,
Abstract: 采用除草剂乙草胺作为土壤污染因子,在人工可控制条件下,研究乙草胺对土壤微生物细菌、真菌和放线菌数量及土壤微生物量碳的影响,并探讨这些微生物学指标对土壤中乙草胺污染状况的指示。研究结果表明:在整个试验过程中,除草剂乙草胺在短时间内对微生物区系能产生明显抑制作用,但随着时间增加和污染物的分解,微生物数量逐渐得到恢复。在短时间抑制过程中,细菌、放线菌数量以及微生物量碳与乙草胺浓度的对数之间有很好的剂量效应关系,第7d细菌数量与乙草胺浓度对数的拟合公式为y=-2.97x+12.36,R2=0.9993;放线菌数量与乙草胺浓度对数的拟合公式为y=-2.13x+6.67,R2=0.9564;微生物量碳在第14d与乙草胺浓度对数的拟合公式为y=-89.25x+348.90,R2=0.9954;其相关性都达到显著水平。而真菌在受到乙草胺污染后,受抑制现象并不明显,真菌对乙草胺有较强的抗性。总之在短期污染条件下,土壤中的细菌、放线菌数量以及微生物量碳可以很好地指示土壤中乙草胺的污染状况。
冬小麦叶面积动态变化规律及其定量化研究
,宇振荣,Driessen P.M .
中国生态农业学报 , 2002,
Abstract: 通过田问试验,对冬小麦叶面积、比叶面积(SLA)及黄叶率(DR)予以描述和定量化,冬小麦冬后比叶面积与相对生育期(RDS)的对数呈线性递减关系,SLA=-21.07×1n(RDS)+19.427,最大和最小比叶面积分别为40m2/kg和19m2/kg。小麦黄叶率在冬后与相对生育期呈抛物线关系,可用下式表示DR=2.142×RDS2-1.8001×RDS+0.6571,这为冬小麦生长模型中的叶面积模拟提供了新的方法和理论依据。
不同土壤培肥措施对华北高产农田生态系统蚯蚓种群的影响
曹志平?,,王宝清?,徐芹?
生态学报 , 2004,
Abstract: 通过在华北高产农田生态系统进行的土壤培肥试验,研究了不同秸秆还田方式和施肥措施对土壤大型动物——蚯蚓的影响。研究结果表明:该区域高肥力土壤共有7种蚯蚓,其中以正蚓科梯形流蚓为主,并同时分布巨蚓科的远盲蚓属、腔蚓属和链胃蚓科的杜拉蚓属的一些广布种。全年平均种群密度为83.83条/m2,最高种群数量出现在1998年8月份,其季节变化趋势为夏季>春季>秋冬季。在投入同量化肥条件下,有机物投入越多,蚯蚓越丰富,其生物量有以下趋势:化肥投入<化肥与麦秸还田<化肥与玉米秸麦秸全还田<化肥与玉米秸麦秸还田加施有机肥处理。在有有机物投入的条件下,化肥对土壤生物的负面效应不明显,不会对土壤中的蚯蚓有较大影响;而单施化肥,对蚯蚓负面影响较为显著。有机肥的施入可以增加蚯蚓的种群数量,随着时间的增加这种趋势越明显。
华北高产农田生态系统中蚯蚓种群次生演替规律
,曹志平?,吴文良?
生态学报 , 2004,
Abstract: 通过对山东省桓台县不同土壤肥力的农田生态系统中蚯蚓种群的调查发现,该地区农田生态系统中有7种蚯蚓,高肥力土壤中蚯蚓相对较丰富,种群密度可达83.83条/m2,梯形流蚓为优势种;低肥力土壤中蚯蚓种群密度40.18条/m2,优势种是天锡杜拉蚓。梯形流蚓和湖北远盲蚓在高肥力土壤中的种群密度要明显高于低肥力土壤;而其他几种蚯蚓种群数量变化不大,随着土壤肥力的演变,低肥力土壤中天锡杜拉蚓的优势地位随着土壤肥力的提高逐渐被梯形流蚓所代替。合理的投入特别是农田有机物投入可以加速农田生态系统中生态演替;试验中不同处理间蚯蚓的种群生物量有以下趋势:化肥投入<化肥与麦秸还田<化肥与玉米麦秸全还田<化肥与玉米麦秸全还田以及有机肥的施用。无论在高肥力还是低肥力的土壤上都表现出相同的规律,但蚯蚓种群组成并没有明显差异。
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