草业科学2018，Vol.35Issue(5)：1254-1265,12.DOI:10.11829/j.issn.1001-0629.2017-0491
氮添加对内蒙古典型草原土壤动物的影响
Effect of nitrogen addition on soil fauna in a temperate steppe of Inner Mongolia
摘要
Abstract
Nitrogen(N)addition effects on plant and soil biota,and functional processes of terrestrial ecosys-tems were studied.The response of soil fauna to nitrogen addition has not yet been well studied in comparison to the studies on the response of plant communities.Here,we studied the effects of N addition on soil biota in a semi-arid steppe community in central Inner Mongolia using a field experiment.The experiment consisted of four N addition levels,applied by adding N fertilizers at four rates,including:0(control),25(low),50(me-dium),and 100(high)kg·ha—1.After 5 years of treatments,we examined the changes in soil fauna commu-nities and their functional groups in response to different N treatments,and analyzed their relationships with environmental factors.The results showed that N addition at the low and medium levels enhanced the abun-dance of soil fauna by 75.8% and 76.7%,respectively,in comparison to that of the control,where as N addi-tion at the high rate significantly decreased the diversity of soil faunas.The responses of soil fauna to N addition varied among functional groups.The abundance of predatory and saprophagous fauna decreased by 6 9.1% and 54.4%,respectively,under the high N treatment;whereas the phytoplasmic and omnivorous functional groups showed no significant changes under different N treatments.The results of RDA analysis also detected a signifi-cant negative correlation between the abundance of Mesostigmata nymphs and Laelapidae and N addition rates, and the abundance of Isotomidae and Entomobryidae were indirectly affected by N addition through the effects on plant species richness,soil organic carbon,and litter pH.Our results indicated that low N addition rates may enhance the abundance of soil fauna in the litter layer of steppe ecosystems,whereas a high N addition rate [>1 0 g ·(m2·a)—1]may decrease the diversity of soil fauna.关键词
氮输入增加/凋落物层/群落结构/功能群/多度/多样性Key words
increased nitrogen input/litter layer/community structure/functional group/abundance/diversity Corresponding author:Ma Wen-hong E-mail:whmapku@126.com分类
农业科技引用本文复制引用
程建伟,郝百惠,刘新民,马文红,李永宏..氮添加对内蒙古典型草原土壤动物的影响[J].草业科学,2018,35(5):1254-1265,12.基金项目
国家自然科学基金(31160119、31370454) （31160119、31370454）
