摘要
以宁夏荒漠草原区沙质草地为研究对象,设置对照、增雨20%、40%、60%、100%5种处理样地,通过调查土壤、植被及地面节肢动物群落特征,初步分析了地表植被和节肢动物群落对当年模拟降雨变化的响应规律。结果表明,1)在增雨试验前,不同处理样地间土壤理化性质、地表植被个体数、类群数和平均高度以及地面节肢动物个体数和类群数均未出现显著差异(P>0.05),说明试验样地设置的相似性和试验方法可行。2)模拟降雨处理后,地表植物丰富度受降雨处理的影响较小,而在秋季,地表植物个体数表现为增雨40%样地显著低于对照样地(P<0.05),植物平均高度表现为增雨20%和40%样地显著低于对照样地(P<0.05)。3)模拟降雨处理后,地面节肢动物个体数受降雨处理的影响较小,而在秋季地面节肢动物类群数表现为增雨20%、60%和100%样地显著高于对照样地(P<0.05)。研究表明,基于影响因子设置不同处理试验样地需综合考虑土壤、植被和节肢动物特征,地面植被个体数和高度以及地面节肢动物类群数对降雨处理响应更为敏感,并存在一定的时滞性。
In order to reveal the response of vegetation and arthropods community to simulating precipitation,the soil properties,vegetation and arthropods characteristics of sandy grassland in desert steppe of Ningxia were evaluated under different treatments including natural precipitation( control),20% more simulating precipitation,40%more simulating precipitation,60% more simulating precipitation and 100% more simulating precipitation. There was no significant difference in soil,vegetation,and arthropods properties between the different treatment plots and prior experiment,which suggested the similarity of experiment plots and practicability of experimental design. After treatments,simulating precipitation had little effects on plant species richness. However,in the autumn,plant density with 40% more simulating precipitation was significantly( P < 0. 05) lower than that with control,and plant height with 20% and 40% more simulating precipitation was significantly( P < 0. 05) lower than that with control.Meanwhile,simulating precipitation also had little effects on arthropod abundance. In the autumn,the arthropod species richness with 20%,60% and 100% more simulating precipitation were significantly( P < 0. 05) higher than that with control. The present results suggested that the comprehensive consideration of all the factors including soil,vegetation and arthropods was necessary for experimental design. The plant abundance and height and arthropod species richness were relatively sensitive to the precipitation although there was time delay.
出处
《草业科学》
CAS
CSCD
北大核心
2014年第12期2333-2341,共9页
Pratacultural Science
基金
国家自然科学基金(41101050)
高校博士学科点专项基金(20126401110003)
中国科学院沙漠与沙漠化重点实验室开放基金(KLDD-2014-003)
国家留学基金委与巴伊兰大学联合奖学金项目[留金发(2013)3018]
关键词
荒漠草原
降雨变化
植物群落
土壤动物
desert steppe
precipitation
plant community
soil arthropod
