摘要
实验旨在研究不同种植模式、作物种间不同的根部隔离处理对线辣椒根际与非根际土壤微生物数量、土壤酶活性及土壤养分有效含量的影响。结果表明:套作栽培的线辣椒根际、非根际土壤微生物数量、酶活性均高于单作栽培。与膜隔处理相比,网隔与无隔处理的根际、非根际土壤微生物数量及酶活性均有提高,其中以网隔处理最高。各处理根际土壤有机质、有效磷、有效钾含量均低于非根际土壤,但碱解氮含量表现为根际土壤高于非根际土壤。网隔处理中尼龙网减缓了玉米根系对线辣椒根系营养的直接竞争,同时玉米根系根际效应使其根际、非根际土壤养分含量在所有处理中最高。土壤微生物主要类群数量是影响土壤酶活性主要因子,与土壤酶活性显著相关。有机质、碱解氮含量与土壤酶活性、微生物数量呈极显著相关,有效磷含量与土壤酶活性、微生物数量呈正相关。土壤真菌数量、脲酶活性与有效钾含量呈负相关。
The effects of different culture patterns, i.e. capsicum monoculture and intercropping, different interspecific root partition treatments, i.e. partition with nylon mesh （MCRM）, partition with plastic sheet （MCRP）, without partition （MCRN）, on soil microbe number, soil enzyme activity and soil nutrient content in the capsicum rhizosphere and non-rhizosphere zones were investigated. The results showed that： soil microbe number and soil enzyme activity of intercropped capsicum rhizosphere and non-rhizosphere zones is higher than that of the monoculture capsicum. Compared with MCRP treatment, the microbe number and enzyme activity of capsicum rhizosphere and non-rhizosphere soil increased in MCRN and MCRM treatments, and the soil microbe number and enzyme activity in MCRM were the highest one. The content of organic matters, available phosphor, available potassium and alkali-hydrolyzable nitrogen in the capsicum rhizosphere soil was less than those of capsicum non-rhizosphere. The soil nutrient content in MCRM was highest one as a result of nylon mesh slowed down the nutrient directly competition of maize root to capsicum root and maize root exudate and rhizospheric effects at the same time. Soil important mircobe group number was main factor influencing soil enzyme activity; besides there was an extremely significant correlation between them. The content of organic matter and alkali-hydrolyzable nitrogen were also extremely significant correlation with soil microbe number and enzyme activity, available phosphor content was positive correlation with soil microbe number and enzyme activity. Soil fungi number and urease activity were negative correlation with soil available potassium content.
出处
《干旱地区农业研究》
CSCD
北大核心
2007年第3期94-99,共6页
Agricultural Research in the Arid Areas
基金
国家"十五"科技攻关项目(2004BA516A09)
