不同林龄杨树人工林对土壤微生物状况和酶活性的影响

对文安县不同林龄的中林-46（Zhonglin-46）杨人工林的土壤微生物和酶活性进行了测定分析。结果表明不同林龄的土壤微生物和土壤酶活性均存在差异，0~20cm的表土层明显高于20~40cm的亚表层和40~60cm深层。在测定时间内（2006年4月—11月）各个林龄的土壤微生物总数在春季较高，夏季较低，秋季又增高，总体上表现为高-低-高的变化。土壤微生物和酶活性之间表现出较高的相关性，土壤微生物的总数和酶活性随着取样深度的增加均表现为逐渐降低。

The Effects of Different Stand Ages on Microbe Populations and Enzyme Activities

The study has undertaken to investigate the soil microbe populations and enzyme avtivities at different soil layers in poplar Zhonglin-46 plantation communities of Wenan county.The soil microbe populations and enzyme activites at 0~20cm depth were higher than that of 20~40cm and 40~60cm.During the experiment time,from Apr to Nov in 2006 ,the total of the microbe populations and enzyme activities had shown a trend of high-low-high .There is a good correlation between the microbial populations and enzyme activities. With the depth added,the microbe populations and enzyme activities declined continually.