不同固沙植物材料对土壤生物活性的影响

在科尔沁地区采集小叶锦鸡儿、樟子松、山竹岩黄芪和差巴嘎蒿这4种22年生固沙群落的土壤样品,对土壤有机C,全N,微生物生物量和主要酶的活性进行了对比研究.土壤按3层取样0~10,10~20,20~30cm.结果表明,4种固沙植物均能明显改善土壤C,N水平,提高微生物生物量,改善土壤酶的活性.尤其是对土壤表层0~10cm的改良效果更加明显.4种材料中,小叶锦鸡儿对土壤生物活性的影响最大,其群落土壤中微生物C,N含量、土壤脲酶、磷酸单酯酶、蛋白酶、脱氢酶的活性均明显高于其他几种植物群落,表现出强大的改善沙土环境的能力,可作为优良的固沙植物材料在当地大面积推广应用.

Influences of Different Sand-Fixation Plants on Biological Activity of Soil

Pinus sylvestris var. rnongolica, Caragana microphylla, Hedysarum fruticosumn and Artemisia haloderidron are widely used in stabilizing shifting sand dune in the semi-arid Horqin sandy grassland of north China. The objective of this study is to reveal how the 22-age plant communities of the above 4 species affect the biological properties of sandy soil quality. Soil samples were taken from each and every plant community at 3 depths (0-10, 10-20, 20-30 cm). The results showed that all the 4 species of plants improve greatly the organic C and total N in soil with microbial biomass accumulated much more and soil enzyme activity improved. Among the 4 plant species, C. microphylla has the highest ability to improve soil biological properties, of which the C and N contents in soil microbial biomass and the activities of phosphataese, urease, protease and dehydrogenase are all higher than those in the other three plants. The C. microphylla thus shows the strongest adaptability to sandy environment and is available to be recommended for wide use in fixing moving sand dune in the semi-arid region.