生态环境学报Issue(3)：409-417,9.DOI:10.16258/j.cnki.1674-5906.2015.03.007
基于三七连作障碍的土壤理化性状及酶活性研究
Properties of Soil Physical-Chemistry and Activities of Soil Enzymes in Context of Continuous Cropping Obstacles forPanax notoginseng
摘要
Abstract
In order to evaluatethe effect of continuous cropping of Panax notoginseng on soil physical-chemical and activities of soil enzymes, in this paper, physical-chemical properties and enzyme activities were analyzed in rhizosphere soil collected from plots whereP. notoginsenghas been cropped for different years and in soil that has been managed with different remedies. The objectives of the present study were to explain the underlying mechanism of continuous cropping obstacle and to provide a theoretical basis for a method to relieve and overcome the continuous cropping obstacle ofP. notoginseng. The result shows that soil pH decreased and soil acidification increased as the cropping time increased. When compared with the uncultivated soil of organic matter, 1-, 2-, and 3-year-cultivated soil of organic matter were decreased by 73%, 87% and 83% , and the cultivated soil had a tendency for hardening. The content of N and P were significantly decreased in the cultivated soil and diseased soil when compared with the uncultivated soil and healthy soil. While the contents of Fe, B and Al were significantly increased by 29%, 31%, 32% respectively, when compared with the uncultivated soil. Acvitivies of protease, catalase, sucrase, phosphatase, and urase in soil significantly decreased as the cropping time proceeded. Activities of protease, catalase, invertase, urease and phosphatase were decreased by 91%, 56%, 52%, 92%, 92% and 69% in the 3-year-cultivated soil ofP. notoginseng than in the uncultivated soil of ones. Activities of catalase, sucrase and phosphatase in diseased soil were higher than those in healthy soil, and the activity of invertase in the former was higher than in the latter even by 42%. In comparison with the continuous cropping soil, the disinfection-treated soil showed the significantly higher activities of urease, protease, polyphenol oxidase and catalase. In addition, the activities of enzyme in soil were significantly correlated with soil pH and contents of organic matter, N, P, K, and some microelements (e.g. Mo and Cu). The results obtained here indicated that continuous cropping ofP. notognseng aggravate soil acidification and hardening and result in the imbalance of soil mineral elements and the enrichment of some elements, this may induce the continuous cropping obstacle ofP. notoginseng. On the other hand, the activities of enzymes in soil were inhibited by the continuous cropping, this would hinder the absorption efficiency of P. notoginseng for some elements and increase the accumulation of soil autotoxic compounds, this may also induce the continuous cropping obstacle.关键词
三七/连作障碍/土壤酸化/矿质元素/土壤酶Key words
Panax notoginseng/continuous cropping obstacle/soil acidification/mineral element/soil enzymes分类
农业科技引用本文复制引用
孙雪婷,龙光强,张广辉,孟珍贵,陈中坚,杨生超,陈军文..基于三七连作障碍的土壤理化性状及酶活性研究[J].生态环境学报,2015,(3):409-417,9.基金项目
国家自然科学基金项目（81360609）；云南省中青年学术技术带头人后备人才培养项目（2014HB011）；云南省科技计划项目 （）
