摘要
通过田间小区试验 ,对不同施肥条件下黄土塬区地膜覆盖栽培玉米与裸地种植玉米各生长期土壤微生物生物量 C、N、P进行了研究 ,其结果表明 :地膜覆盖栽培各生长期玉米地的微生物量 C均低于裸地种植玉米地 ,微生物量 N与 C的趋势基本一致 ,其中苗期表现最明显 ;而微生物量 P有所不同 ,拔节期地膜覆盖玉米地的微生物量 P明显低于裸地种植玉米地 ,抽雄期则是前者明显高于后者。研究表明地膜覆盖种植玉米对土壤微生物量 C、N、P产生重要影响 ,其影响程度与作物生育期有关。
Plastic covering is an efficient planting measure for rising production. It has been recently applied and extended widely in dryland farming areas of northwestern China. Especially, on the Loess Plateau, there are increasing areas of plastic cover. Plastic cover can change the soil temperature, moisture, air and sun light as well, and consequently influence the soil physical, chemical and biological properties. Soil microbe is a driver of material transaction and nutrient cycle in soil system. Soil microbial biomass carbon (C), nitrogen (N) and phosphorus (P) are recognized as a reservoir of soil active nutrients. At the same time, it is very sensitive to environmental factors, and thus can be served as one evaluation indicator of soil quality. The present study was conducted in field plots at Weibei dry area of the Loess Plateau to (1) investigate the changes and difference of soil microbial biomass (C, N, P) in the different growing stage of corn under different situations of fertility in plastic cover cultivation and no-cover lands; (2) monitor the influence of soil microbial biomass on the soil nutrient cycle in the plastic covering land; and (3) evaluate the effect of plastic cover cultivation on soil environmental factors.The field experimental research was conducted at Changwu Agro-ecological Experiment Station on Loess Plateau, Chinese Academy of Sciences. 30 field plots with each area of 32 m 2 (4×8 m 2) were employed. 18 plots were treated with plastic cover cultivation with 6 fertilizer treatments (1=N1P1, 2=N1P2, 3=N1P3, 4=N2P1, 5=N2P2 and 6=N2P3) (N1=112.5 kg/hm 2, N2=225 kg/hm 2, P1=75 kg/hm 2, P2=150 kg/hm 2, P3=225 kg/hm 2), and 12 plots were served as control plots (no-cover) also with 6 fertilizer treatments. Soil samples were taken in a depth of 0～20 cm in each growing stage. The chloroform fumigation-extraction method was used to test the microbial biomass (C, N, P). Results show that soil microbial biomass carbon under plastic cover cultivation were less than those of no-cover culti
出处
《生态学报》
CAS
CSCD
北大核心
2002年第4期508-512,共5页
Acta Ecologica Sinica
基金
中国科学院知识创新工程资助项目 ( KZCX1 -0 6 -0 2 -0 1 )
国家自然科学基金部分资助项目 ( 4 990 1 0 1 2 )
关键词
地膜覆盖
土壤微生物量
玉米生长期
plastic cover cultivation
soil microbial biomass
corn growth periods
