Some soil microbial activity parameters and heavy metals contents were analyzed by principal component method . the results showed that the critical levels of cadmium and lead in red clayed soil and red sandy soil were 15 mg . kg - 1 and 0 - 15 . mg . kg - 1 , 200 mg . kg - 1and 200 - 400 mg . kg - 1 , respectively . soil microbial populations and functional diversities of microbial community have changed to some extent under the stress of cadmium and lead pollution 在本文中我们将供试红壤的上述微生物活性指标和2种重金属含量进行主成分因子分析，其结果得出，红黄泥和红砂泥的土壤微生物活性镉胁迫的临界承载量分别为15mg ? kg ~ 1和0 15 ? mg ? kg ~ 1 ；铅胁迫的临界承载量分别为200mg ? kg ~ ( - 1 )和200 400mg ? kg ~ ( - 1 ) 。
Severe fires can often cause changes in successional rates and soil hydrologic functions , degradation of soil physical properties , alter c : n ratios , and result in subsequent nutrient loss through accelerated erosion , leaching or denitrification , and alterations in microbial populations and associated process can occur 高强度火烧往往能引起演替频率的改变，土壤物理性质退化，水文功能发生改变，改变c n比，加剧侵蚀、淋溶和反硝化作用，导致养分流火，微生物数量及其相关过程发生变化。
From the aspects of agricultural economic and environmental ecological effects , were the effects and mechanism of rare - earth micro - fertilizer to improve the growth , development , quality and yield of the crops ; the adjustment of crops growth by influencing the number of microbial population in soil district and the function of the soil dehydrase , alkaline phosphatase , urease and sucrase ; the ecophysiological effects of alleviating the injure of acid rain , ultraviolet radiation , heavy metal on crops were illustrated ; the sureness of bee ' s use in agricultural was provided , according to the rule of the distribution and enrichment of be in crops 摘要从农业经济效应和环境生态效应二方面，论述了稀土肥料促进作物生长、发育，提高作物产量，改善作物品质的效应与机理；影响土壤区系中微生物种群数量和土壤脱氢酶、碱性磷酸酶、脲酶及蔗糖酶的功能，继而反馈调节作物生长；缓解酸雨、紫外辐射和重金属伤害作物的生态生理学效应；并以稀土在作物体内分布与富集规律为参考，探讨了稀土农用的安全性。
Seven plots selected from wanglang reserve were distributed in different types of forest and at different altitude , and different plot has different microclimate . soil property , microbial population , soil nutrient content of forest soil were determined in wanglang natural reserve , from may to october 2002 to july 2003 , the ecological distribution of three main groups , bacteria , actinomycete and fungi were determined in the forest soils by the cell enumeration methods . six kinds of physiological groups , including ammoniation bacteria , nitrification bacteria , nitrosification bacteria , aerobic autogenesis azotobacter , aerobic cellulose - decomposing bacteria and anaerobic cellulose - decomposing bacteria were enumerated by the most - probable number ( mpn ) 2001年10月在王朗自然保护区内设立了3个定位研究样地和4个临时样地，通过多次现场采样与室内实验分析，测定了白桦林、岷江冷杉林、紫果云杉林、绣线菊-羊茅群落、羊茅群落及高山柳灌木丛等6种不同植物群落内土壤微生物三大类群数量、功能微生物数量、土壤养分，并在固定样地内使用埋袋法进行了三个埋藏深度的凋落物分解袋试验，初步研究了枝条、阔叶、针叶等凋落物组分在不同分解阶段所含养分的动态变化。
The company hire experts as consultants , and some technology and management personnel from bohai tea factory 、 liming tea factory 、 dadugang tea factory who use traditional techniques combined with modern technology discovered the relations about puer tea ' s chemical and the quality , from the scientific point of contribution puer tea system , prove that processing puer tea is the main enzymes of microbial populations and the quality of component changes 公司聘请著名茶叶专家为顾问，同时还聘请了勐海茶厂、黎明茶厂、大渡岗茶厂的技术骨干和管理人员，利用传统工艺，结合现代技术，不断探索普洱茶化学成份与其品质的关系，从科学的角度建立普洱茶体系，探明了普洱茶加工过程中主要微生物种群和酶类相对于质量成份的变化。
