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在棉麦两熟双高产条件下研究了棉花根际与非根际土壤酶活性和养分含量的变化.结果表明,套作棉土壤脲酶、蔗糖酶、蛋白酶及过氧化氢酶活性随生育进程的变化趋势与单作棉表现一致,但整个生育期套作棉根际与非根际土壤各种酶活性均明显高于单作棉.套作棉根际与非根际土壤养分含量在麦棉共生期低于单作棉或差异较小,而在麦收后则显著高于单作棉.套作棉土壤养分含量随生育进程的变化趋势与单作棉大体相同,但一些养分的吸收高峰晚于单作棉.无论套作棉还是单作棉,根际土壤酶活性和养分含量高于非根际.土壤各养分含量与土壤脲酶、蔗糖酶和蛋白酶活性呈显著(P=0.05,n=32)或极显著(P=0.01,n=32)相关,与土壤过氧化氢酶活性相关不显著.
The changes of soil enzyme activities and nutrient contents in cotton rhizosphere and non-rhizosphere soil were studied under the conditions of double cropping and double yield of cotton and wheat.The results showed that the activities of urease, invertase, catalase and catalase increased with the development of cotton The trend of variation was consistent with that of single cropping cotton, but the activities of various enzymes in rhizosphere soil and non-rhizosphere soil were significantly higher than those in single cropping cotton during the whole growing period.The soil nutrient contents in rhizosphere soil and non- The symbiotic period was lower than that of single cropping cotton or smaller than that of single cropping cotton, but significantly higher than that of single cropping cotton after harvesting wheat.The trend of soil nutrient content with fertilization was the same as that of single cropping cotton, but some nutrient uptake late The soil enzyme activities and nutrient contents in rhizosphere soil were higher than those in non-rhizosphere soil, and the contents of soil nutrients and soil urease, invertase and protease activities were significant (P = 0.05, n = 32) or extremely significant (P = 0.01, n = 32), but not significantly correlated with soil catalase activity.