Dynamics of soil enzyme activity and nutrient content in intercropped cotton rhizosphere and non-rhizosphere

Abstract

Abstract: The study with high yield cotton-wheat double cropping system showed that soil urease,invertase,protease and catalase activities in intercropped cotton field had the same changing trends with those in mono-cultured cotton field,but were significantly higher in intercropped than in mono-cultured cotton rhizosphere and non-rhizosphere at all development stages of cotton.During the intergrowth period of wheat and cotton,soil nutrient contents in intercropped cotton rhizosphere and non-rhizosphere were lower than or had little difference with those in mono-cultured cotton rhizosphere and non-rhizosphere,but became significantly higher after wheat harvested.The changing trends of soil nutrient contents in intercropped cotton field had little difference from those in mono-cultured cotton field,but the nutrient absorption peak appeared late.The soil enzyme activities and nutrient contents were generally higher in rhizosphere than in non-rhizosphere of both intercropped and mono-cultured cotton.Soil nutrient contents had significant(P<0.05,n=32) or very significant(P<0.01,n=32) correlation with the activities of soil urease,invertase and protease,but had little correlation with soil catalase activity.

Key words: Wheat-cotton double cropping, Cotton, Rhizosphere and non-rhizosphere zones, Soil enzyme activity, Soil nutrient content

CLC Number:

S154.2

MENG Yali, WANG Liguo, ZHOU Zhiguo, WANG Ying, ZHANG Lizhen, BIAN Haiyun, ZHANG Siping, CHEN Binglin . Dynamics of soil enzyme activity and nutrient content in intercropped cotton rhizosphere and non-rhizosphere[J]. Chinese Journal of Applied Ecology, 2005, 16(11): 2076-2080.

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