摘要
对中国东部不同纬度带的6个地区的土壤微生物碳进行了研究。结果表明土壤微生物碳的分布受地理位置的影响较为明显:由北向南,东北地区的土壤微生物碳要高于其他地区。作为土壤有机质变化的灵敏度指标———微生物熵(微生物碳/总有机碳),在同一耕作方式下,其在不同地区的变化受土壤利用方式的影响较为明显:在连作系统下,菜地>粮地;而在轮作系统下,粮食-蔬菜轮作>蔬菜-蔬菜轮作。利用相关性分析寻求影响微生物碳分布的环境因素,结果表明,微生物碳(Micro-C)与土壤有机碳(TOC)、全氮(TN)、土壤含水率呈极显著正相关,而有机碳和全氮的分布主要受地理位置的影响。对不同土壤类型的微生物碳和微生物熵进行相关性分析,结果显示pH、年均温、含水率、TOC和TN是主要影响因素,关键影响因素因土壤类型不同而各异。
The soil microbial carbon in arable soils of Eastern China was investigated by using the fumigation- extraction （FE） method. The investigated arable soils span from 46. 69846°N to 28. 39281°N, and are of different tillage types. The results show that, from north to south, the soil microbial C （Micro-C） content in Northeast China is much higher than that in other locations, and the total organic carbon （TOC） and total nitrogen （TN） have the same trends. The correlation analysis showed that the soil type determined by specific environmental climatic condition and thus the geographic position plays a key role in controlling the Micro-C distribution. The soil quality, an index for which is the ratio of Micro-C to TOC calculated, is much related to the tillage type. Average annual temperature, pH, moisture, TOC and TN are the five main factors affecting the Micro-C content and the ratio of microbial C to TOC for a certain soil type, but the key controlling factors varies among different soil types.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2011年第6期134-142,共9页
Earth Science Frontiers
基金
国土资源部公益性行业科研专项(200911020)
教育部高等学校博士学科点专项科研基金项目(新教师类)(20100022120009)
生物地质与环境地质国家重点实验室开放课题(BGEG1001)
关键词
中国东部
土壤微生物碳
土壤微生物熵
eastern China
soil microbial C
the ratio of microbial C to TOC
