生态学报2017，Vol.37Issue(2)：387-394,8.DOI:10.5846/stxb201508091678
不同植茶年限土壤碳氮养分及胞外酶对干旱胁迫的响应
The response of soil nutrients (carbon and nitrogen) and extracellular enzyme activities to drought in various cultivation ages from tea orchards
摘要
Abstract
Frequent summer droughts,caused by climate change,have negatively affected the productivity and quality of tea orchard soil.Tea (Camellia sinensis L.) is an important cash crop in southern China,therefore it is important to examine soil nutrients,enzyme activity,and microbial community structural shifts under such summer drought conditions in various cultivation ages.In this study,the pot method was utilized to investigate the soil quality of various cultivation ages of 0,10,30,and 50 years.These pots were incubated at 25℃ and given two different water treatments (30％ and 55％ WFPS (water-filled pore space)).Throughout the incubation period,soil samples were taken to measure the soil carbon,nitrogen content,and extracellular enzyme activities at 0,7,and 14 days.The results indicated that prior to the incubation period,nitrate nitrogen,ammonia nitrogen,microbial nitrogen,and the total organic carbon in the soil increased with cultivation age.The microbial carbon and the extracellular enzyme activities (β-1,4-glucosidase activity related to soil carbon and N-acetylglucosaminidase and 1-1eucine aminopetidase activity related to soil nitrogen) were highest at the cultivation age of 30.Soil samples taken under drought conditions,displayed increased extracellular enzyme activities,soil organic carbon,soil nitrate nitrogen,and ammonia nitrogen contents while soil microbial carbon and extracellular enzyme activities declined.The soil samples taken from a cultivation age of 30 exhibited a relatively high amount of dissolved organic carbon,microbial nitrogen,nitrate nitrogen,and soil extracellular enzyme activities throughout all incubation periods.The drought conditions had a significant influence on the contents of soil nitrate nitrogen,ammonia nitrogen,total organic carbon,and microbial carbon.Furthermore,the correlation analysis of soil carbon and nitrogen related biochemical properties indicated that the carbon and nitrogen soil nutrients affected one another.The results of the study indicated that a 30-year cultivation of the tea tree had a positive effect on the accumulation of soil nutrients but tea tree cultivation for almost 50 years produced an inferior micro-ecological environment.Thus,to improve the soil environment in tea orchards,measures such as balancing fertilization and green cover,should be considered.关键词
茶园土壤/植茶年限/土壤养分/胞外酶活性/干旱Key words
tea orchards/cultivation age/soil nutrients/extracellular enzyme/drought引用本文复制引用
赵杏,钟一铭,杨京平,吕亚敏,王小鹏..不同植茶年限土壤碳氮养分及胞外酶对干旱胁迫的响应[J].生态学报,2017,37(2):387-394,8.基金项目
高等学校博士学科点专项科研基金资助项目(20130101110127) （20130101110127）
水体污染控制与治理科技重大专项资助项目(2014ZX07101-012) （2014ZX07101-012）
