沙漠腹地咸水滴灌林地土壤养分、微生物量和酶活性的典型相关关系

鉴于塔里木沙漠公路防护林所处环境条件和管理模式的特殊性及在南疆社会、经济发展中的重要性,试验选择四种不同矿化度(2.58、5.75、8.90、13.99 g L-1)水滴灌的防护林地,采集0~5 cm、5~15cm、15~30 cm、30~50 cm四层土样为研究材料,主要采用典型相关分析法,对防护林地土壤养分因子、微生物量因子和酶活性因子中每两组变量间的相关性进行了分析。结果表明:三组变量土壤养分、微生物量、酶活性中,每两者之间均有显著的典型相关变量存在,而且基本能够代表变量总体相关信息;土壤养分与土壤微生物量的相关性主要由养分中的全氮、速效氮、有机质、全磷含量和土壤微生物量中的放线菌数量、微生物量碳和微生物量磷引起的;土壤养分与土壤酶活性的相关性主要由土壤有机碳、速效钾含量与土壤过氧化氢酶、磷酸酶活性的相关性引起;土壤微生物量与土壤酶活性的相关性主要由土壤微生物量磷、微生物量氮与土壤蔗糖酶、磷酸酶活性的相关性引起;滴灌水矿化度对塔里木沙漠公路防护林地土壤养分和微生物量的效应明显,高矿化度水不利于土壤养分积累和微生物生存。

CANONICAL CORRELATIONS OF SOIL NUTRIENTS,MICROBIAL BIOMASS AND ENZYME ACTIVITY OF FOREST LAND DRIP-IRRIGATED WITH SALINE WATER IN THE HINTERLAND OF TAKLIMAKAN DESERT

In view of the particularity of the environmental conditions and management model,of the Tarim desert highway shelter forest,and the important roles of the forest in development of the socio economy of South Xinjiang,an experiment was carried out using sampled soils from four layers,0~5 cm,5~15 cm,15~30 cm,30~50 cm,in the forest lands dripirrigated with ground water,2.58,5.75,8.90 and 13.99 g/L^-1 in minera lization degree,respectively.Results showth at there are obvious canonical correlation variab les between soil nutrient,microbe quantity and enzyme activity,which basically represents general correlation between variables;the correlation between soil nutrients and soil microbial biomass is mainly attributed to total N,available N,organic matter,total P of nutrient factors and actinomycetes quantity,microbial biomass C and microbial biomass P,while the correlation between soil nutrients and soilenzyme activity is to organic carbon,available K of soil nutrient factors and catalase activity,phosphatase activity of soil enzyme activity factors;and the correlation between soil microbial biomass and soil enzyme activity is to microb ial biomass P,microbial biomass N,invertase activity,and phosphatase activity of soil enzymes Moreover,vertical differences between these three groups of comprehensive factors were found So,the effects of mineralization degree of ground water used as irrigation water on soil nutrients and microbial biomass in the Tarim desert highway shelter forest land are remarkab le,and ground water,high in mineralization degree goes against soil nutrien taccumulation and microbe survival.