沙地柠条灌丛枯落叶输入特征及对土壤理化性质的影响  

Leaflitter input of Caragana kornshinskii and its effect on soil properties in desertified grassland

作　　者：刘佳楠 刘任涛 赵娟 常海涛 罗雅曦 张静[2] 马继 LIU Jianan;LIU Rentao;ZHAO Juan;CHANG Haitao;LUO Yaxi;ZHANG Jing;MA Ji(Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwestern China of Ministry of Education,Ningxia University,Yinchuan 750021,China;College of Agriculture,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学西北退化生态系统恢复与重建教育部重点实验室,银川750021 [2]宁夏大学农学院,银川750021

出　　处：《干旱区资源与环境》2018年第11期169-175,共7页Journal of Arid Land Resources and Environment

基　　金：教育部-霍英东教育基金(151103);中国科学院"西部之光"项目(XAB2016AW02);国家自然科学基金项目(41661054);宁夏留学人员科技活动择优资助项目(宁人社函【2016】494号);宁夏"生态学"西部一流学科建设项目(NXYLXK2017B06);宁夏大学研究生创新项目(GIP2018075)资助

摘　　要：以宁夏盐池县沙地柠条灌丛枯落叶为研究对象,通过调查不同大小类型灌丛微生境空间方位上枯落叶分布特征,分析柠条灌丛枯落叶输入特征及其对土壤理化性质的影响。结果表明:1)随着柠条冠幅增大枯落叶累积量亦逐渐增加,即Ⅳ(大型灌丛)>Ⅲ(中型灌丛)>Ⅱ(小型灌丛)>Ⅰ(极小型灌丛),并且,Ⅱ类灌丛微生境北边方位枯落叶累积量显著小于其他3个空间方位(p<0.05)。2)土壤含水量表现为Ⅰ、Ⅱ类灌丛微生境显著低于Ⅲ、Ⅳ类(p<0.05)。土壤温度则随灌丛减小而呈逐渐增加趋势。土壤pH表现为Ⅱ>Ⅰ>Ⅲ>Ⅳ。土壤电导率与土壤速效钾均表现为Ⅲ类灌丛显著高于Ⅰ类和Ⅱ类,Ⅳ类居中(p<0.05)。3)相关分析表明,土壤水分既与总枯落叶累积量呈正相关(p<0.05),亦与东边、西边和北边方位枯落叶累积量呈正相关(p<0.05)。土壤温度只与西边方位枯落叶累积量呈显著负相关(p<0.01)。土壤pH与枯落叶累积量呈负相关(p<0.05),而与南边和北边方位枯落叶累积量呈显著负相关(p<0.01)。土壤速效钾既与柠条灌丛下总枯落叶累积量呈正相关(p<0.05),亦与南边、北边和西边方位枯落叶累积量呈正相关(p<0.05)。研究表明,不同大小类型灌丛微生境枯落叶输入分布的空间差异性对土壤理化性质产生一定的影响,而且对某些土壤因素的影响存在一个灌丛大小阈值范围。Taking the leaf litter of Caragana shrubs as a subject,an investigation on leaf litter input from four aspects beneath shrub canopy was carried on in response to shrub size in Yanchi County of Ningxia. The soil physical-chemical properties were analyzed to probe into the effect of leaf litter input on soil properties. Results were followed as：（ 1） There were increased litter input from the very low through low toward medium and big size of shrub canopy,i. e.,Ⅳ（ very small）〉 Ⅲ（ small） 〉Ⅱ（ medium） 〉Ⅰ（ big）. Beneath shrub canopy of low size,it was found that the litter input was significantly（ p〈0. 05） lower in the northern aspect relative to the southern,western and eastern aspects.（ 2） Soil moisture content was found to be significantly（ p〈0. 05） lower in the habitats beneath shrub canopy of Ⅰand Ⅱ relative to those of Ⅲand Ⅳ. Soil temperature was found to be significantly（ p〈0. 05） lower in the habitats beneath shrub canopy of Ⅳ relative to those of Ⅰ,with the intermediate value in those of Ⅱ and Ⅲ. Soil pH was found to be followed as Ⅱ 〉Ⅰ 〉Ⅲ 〉Ⅳ. Both soil electrical conductivity and soil available potassium were found to be significantly（ p〈0. 05） greater in the habitats beneath shrub canopy of Ⅲ relative to those of Ⅰ and Ⅱ,with the intermediate value in those of Ⅳ.（ 3） There was a positive（ p〈0. 05） correlation of soil moisture with leaf litter input,particularly with that on the eastern,western and northern aspects beneath shrub canopy. Soil temperature was found to be negatively（ p〈0. 05） correlated with leaf litter input on the western aspect beneath shrub canopy. Soil pH was found to be negatively（ p〈0. 05） correlated with leaf litter input,particularly with that on the southern and northern aspects beneath shrub canopy. Soil available potassium were found to be positively（ p〈0. 05） correlated with leaf litter input,particularly with that on the western,southernand northern aspe

关 键 词：沙地 柠条 枯落叶 土壤性质 物质循环 

分 类 号：Q948[生物学—植物学]