黄土沟壑区植被恢复中土壤生物学特性的响应及其评价

摘要：了解不同植被恢复类型对土壤生物学特性的影响。以农地为对照，该研究通过对侧柏天然次生林、不同林龄（5,20,30年）刺槐人工林、荆条灌丛和苜蓿草地6种不同植被恢复类型土壤生物学特性的探索研究。结果表明，与对照相比，不同的植被恢复类型土壤生物学特性均有明显增强，土壤微生物量及土壤酶活性显著提高。采用土壤微生物量碳、氮、磷和尿酶、碱性磷酸酶、过氧化氢酶、蔗糖酶7项指标计算该区域土壤生物学特性，进行土壤生物学特性等量评价。不同植被恢复模式土壤生物学特性的大小顺序为：30年刺槐、20年刺槐、侧柏、荆条、5年刺槐、苜蓿、农地。该区采用刺槐恢复模式效果较优于苜蓿及荆条、侧柏模式。

Soil microbial character and assessment of different vegetation restoration in the gully region of Loss Plateau

The farmland was taken as control,the soil biological character of six vegetation restoration types such as Platycladus orientalis（B）,Vitex negundo（J）,30-year Robinia pseudoacacia（C 30）,20-year Robinia pseudoacacia（C 20）,5-year Robinia pseudoacacia（C 5）,Medicago sativa L（M） were studied.The results showed that the soil biological character was improved obviously compared to farmland.The microbial biomass and enzyme activities increased apparently compared with the farmland.The soil microbial biomass C,N,P,and the activity of soil catalase,alkaline phosphatase,ureases and invertase were used to evaluate the soil microbial characters quantitatively.The order of soil microbial characters with different vegetation restoration models was：30-year Robinia pseudoacacia,Platycladus orientalis,20-year Robinia pseudoacacia,Vitex negundo var.heterophylla,5-year Robinia pseudoacacia,Medicago sativa L.In a word,the soil microbial character of Robinia pseudoacacia is better than other vegetation restoration in Loess hilly area,and with the time longer,the soil microbial character is better.