摘要
为探讨科尔沁沙地不同人工固沙植物群落土壤微生物生物量、土壤酶活性的季节动态规律,选取25年生小叶锦鸡儿、山竹岩黄蓍、差巴嘎蒿、樟子松群落为对象,研究了固沙植物群落0～30cm土壤蛋白酶、脲酶、蔗糖酶、磷酸单酯酶、多酚氧化酶、硝酸还原酶、脱氢酶7种酶活性和微生物生物量C、N、P不同季节的变化特征。结果表明,4种人工植物群落土壤7种酶活性有明显的季节性变化,均表现为春季开始逐渐升高,到夏季植物旺盛时逐渐达到最大值,秋冬季达到最低值。微生物生物量C、N的动态变化与土壤酶活性的变化规律相同,而土壤微生物量P的季节变化则表现为春季>夏季>秋季,这些变化在0～10cm土层更为显著。7种土壤酶活性和微生物生物量最高值均出现在土壤表层(0～10cm),随着土层的加深生物活性逐渐降低。小叶锦鸡儿群落土壤微生物生物量和7种酶活性均高于其他3种植物群落。
In order to approach the seasonal dynamics of soil microbial biomass and enzyme activities in different sand-fixation plantations on Horqin sandy land,25-year old Caragana microphylla,Hedysarum fruticosum,Artemisia halodendron and Pinus sylvestris var. mongolica plantations were selected,with the seasonal variations of the protease,urease,saccharase,phosphomonoesterase,polyphenol oxidase,nitrate reductase,and dehydrogenase activities as well as the microbial biomass C,N and P in 0-30 cm soil layer studied. The results showed that the activities of the seven enzymes in the four plantations varied significantly with season,i.e.,increased gradually in spring,reached the maximum in summer,and decreasing in autumn and winter,with the variation degree being more significant in 0-10 cm soil layer than in other soil layers. The enzyme activities and microbial biomass were the highest in 0-10 cm soil layer,and decreased down the profile. Among the four plantations,C. microphylla had the highest soil enzyme activities and microbial biomass,with the highest capability in improving the biological activity of sandy soil.
出处
《生态学杂志》
CAS
CSCD
北大核心
2011年第2期227-233,共7页
Chinese Journal of Ecology
基金
国家自然科学基金项目(40871247)
国家公益性行业科研专项经费项目(201004023)
中央高校基本科研业务费项目(N090405010)资助
关键词
微生物生物量
土壤酶活性
生物活性
季节动态
小叶锦鸡儿
microbial biomass
soil enzyme
biological activity
seasonal dynamics
Caragana mircophylla.
