石灰岩退化生态系统不同恢复阶段土壤酶活性研究

Soil enzyme activities of limestone degraded ecosystem at its different restoration phases.

研究了石灰岩退化生态系统不同恢复阶段的土壤酶活性.结果表明,石灰岩退化生态系统土壤酶活性在土壤剖面上无明显的递减规律;随着演替进展,土壤酶活性增强,土壤酶活性随植被特征、土壤类型以及酶本身的性质不同而表现各异.整体上石灰岩各阶段土壤酶活性:灌木林>柏木乔林>草本,同一植被类型下石灰岩柏木林>紫色砂岩柏木林.石灰岩退化生态系统土壤酶活之间以及酶活与pH值之间无显著相关性,而含水率和土壤全氮则与土壤酶活性呈显著或极显著相关,说明水分以及养分是石灰岩地区生态恢复的关键性因子.不同类型的土壤酶在同一植被土壤系统中酶活性表现不一,同一种酶在同一土壤类型而不同的生态恢复阶段酶活性表现不一,同一植被类型下的不同土壤类型中酶活性也有分异.

The study showed that there was no distinct descending of enzyme activities along the soil profile of limestone degraded ecosystem,which were enhanced with progressive succession,and varied with vegetation characteristics,soil types,and soil enzyme properties.On the whole,soil enzyme activities enhanced in order of herb < Cupressuss funebris high forest<shrubbery,and under the same vegetation,limestone Cupressuss funebris high forest had higher soil enzyme activities than purple psammophytia.There was no significant correlation between soil enzyme activities and soil pH,while significant correlation was found between soil moisture content,soil total nitrogen content and soil enzyme activities,indicating that soil water and nutrient contents were the key factors of ecological restoration in this region.Different soil enzymes in the same vegetation-soil system as well as the same enzyme in the same soil type but at different restoration phases had different activities,so did for the same type vegetation but different soil type.