Effects of fertilizer and weed species richness on soil nematode community in a microcosm field experiment  

作　　者：Xinli Niu Yongfan Cheng Xiaopei Feng Feng Sun Yanfang Gu 

机构地区：[1]School of Life Science,Henan University,Kaifeng 475004,China [2]School of Life Science,South China Normal University,Guangzhou 510631,China

出　　处：《Soil Ecology Letters》2023年第1期151-168,共18页土壤生态学快报（英文）

基　　金：supported by the National Natural Science Foundation of China(31070394);the Natural Science Project of Henan Province(162300410009);the National University Innovation and Entrepreneurship Training Program(202110475087).

摘　　要：Both fertilizer and plant species richness may affect the soil nematode community.However,the influence of fertilizer and weed species richness interaction is unclear.Nematode abundance and biodiversity in wheat and weed plots soil treated with nitrogen,phosphate and potassium fertilizer addition and weed species richness(0,1,2 and 4 weed levels)were investigated in a long-term microcosm experiment established in 2010 at Kaifeng,China.The results demonstrated that fertilizer treatment increased the abundance of total nematode,bacterivores,and plant parasites whereas it decreased the total genera number,the Shannon-Wiener diversity index(H'),Margalef richness index(SR),the total maturity index(∑MI),and structure index(SI),and degraded the structure of the nematode community.In contrast,weed species richness increased these ecological indices and enhanced the structure of the nematode community.Principal component analysis(PCA)indicated that the fertilizer's effect was more significant than weed species richness.Redundancy analysis(RDA)demonstrated that fertilizer affected soil nematode mainly through increasing soil available phosphorus by 4.71 times and ammonium nitrogen content by 74.03%;weed species richness increased the diversity indices of soil nematode mainly through enhancing soil moisture by 2.07%.Our results suggest weed species richness may relieve the negative effect of fertilizer on the diversity of soil nematode community.

关 键 词：FERTILIZER Farmland weed Weed species richness Soil nematodes Community structure Soil food web 

分 类 号：S154.386[农业科学—土壤学]