Distributing pattern of soil properties , including soil moisture and nutrients beneath the natural shrubs of sabina vulgaris and its ecological adaptability of clonal traits to sandy habitats in mu us sandland were studied using field experiments 应用野外实验生态学方法研究了毛乌素沙地天然臭柏灌丛地土壤资源的分布格局及天然臭柏克隆特性对沙地环境的生态适应性。
Compared with jiang ' s regressive model , the soil rates by 137cs tracer is lower about 10 % than that by jiang ' s regressive mode when they has been used to estimate rates of soil loss on runoff plots 因此，在利用~ ( 137 ) cs技术示踪农耕地土壤侵蚀速率时，这四个模型各自计算的土壤侵蚀速率差异较小。在估算径流小区土壤侵蚀速率中各模型与江忠善经验回归模型的结果相差都在10左右。
For the cultivated study field , the 137cs concentration is relatively uniform within the plough layer . 2 . the difference and sameness among the existing l37cs models have been discussed , and their precision have been validated by comparing with the regressive model of soil erosion 分析了~ ( 137 ) cs示踪农耕地土壤侵蚀速率模型间的异同，并以土壤侵蚀的经验回归模型为参照对~ ( 137 ) cs法计算的土壤侵蚀速率进行验证。
3 . it is clear that co2 concentration of epikarst ecosystem has been influenced for rain . the varied range of soil co2 concentration is mainly influenced by rain frequency , secondly the amount of rainfall for the epikarst ecosystem of woodland and uncovered land 3大气降水对表层带岩溶生态系统各层coz有明显的“沉淀”作用，影响林地与裸地土壤各层coz浓度降低的幅度主要取决于降雨的频率，其次才是降雨量，而影响植被? ?空气系统各层co 。
Generally , soil total p increases after burning , but the soil total p after moderate and high intensity fires returned to level before burning slower than after low intensity fires , which is consistent with soil available n . the changes of soil k , mg are great after burning 但6年以后，土壤氮的含量有增加的趋势。除少数迹地外，火烧后土壤全磷含量在若干年内呈增加的趋势，但中、高强度火烧迹地土壤全磷含量的恢复较低强度火烧迹地慢。
But the main metabolite of quizalofop - p - ethyl was decomposed much more slowly both in sesame plant and soil . the total residue of quizalofop - p - ethyl and its metabolite in sesame seeds after harvested was less than 0 . 02 mg / kg ( the recommended mrl of fao is 0 . 02 mg / kg in peanut seed ) 田间残留试验结果显示：精喹禾灵在芝麻地土壤和芝麻植株中降解迅速，半衰期分别为1 . 35和1 . 18d ，其主要降解产物精喹禾灵丙酸在土壤和植株中的半衰期则较长。
The plant communities were surveyed , and the microclimates were observed , and the soil fertilities were determined in jinyun mountain in a series of fragmental evergreen broadleaved forests with different size and slope aspect , in comp " is n with continuous evergreen broadleaved forest 本实验以不同大小、处于不同坡向的典型片断化常绿阔叶林为对象，并以连续常绿阔叶林作对照，在缙云山进行了植物群落调查、群落小气候观测以及样地土壤肥力的测定。
In order to instruct the afforestation in daqing city and saline - alkali land park of the no . 7 oil production company , growth conditions of afforestation trees in 131 soil point with different soil soluble salt of 0 . 1 % ~ 0 . 3 % , 0 . 3 % ~ 0 . 5 % , 0 . 5 % ~ 0 . 7 % and > 0 . 7 % were investigated and analyzed based on chemical properties mensuration of the plan land soil in different surface layer and referred to different stalt - resistance upper limit of trees 摘要为更好地指导大庆市及采油七厂公园盐碱地的绿化，在规划地土壤表层化学性质测定的基础上，参照不同树木耐盐能力上限，分别对全盐量在0 . 1 % ~ 0 . 3 % 、 0 . 3 % ~ 0 . 5 % 、 0 . 5 % ~ 0 . 7 % 、 > 0 . 7 %的131个样点上绿化树种的生长状况进行了调查及分析，并进而给出了树种选择及绿化工作的建议。
The outcomes show that the sequence of soil erosion of types of land use in different regions is different and the sequence of soil erosion of types of land use in different periods of the same regions is uncertainty ; the occurred rate of soil erosion of new wasteland is higher than that of idle wasteland for years ; the occurred rate of soil erosion of grassland is higher ; the occurred rate of soil erosion of non - irrigated farmland is high and the soil erosion intensity of land used for construction is great during construction and becomes smaller after completion 结果表明：不同区域土地利用类型的土壤侵蚀序列各不相同，而同一区域不同时期土地利用类型的土壤侵蚀序列不确定；新出现的难利用地比长期闲置的难利用地土壤侵蚀发生率高；草地土壤侵蚀发生率偏高；耕地中旱地的土壤侵蚀发生率高；建设用地建设时土壤侵蚀强度大，而建成后土壤侵蚀强度小。
This research object is the biology water protecting measures of the antaibao surface opencast coal mine ( atb ) south stackpile within loess area , including 4 aspects as below : ( 1 ) the form and distribution characteristics of erosion in original and newly - constructed lands of the atb south stackpile . the original water erosion modulus is 3700 ~ 4400t / km ~ ( 2 ) a in the south stackpile 本研究以我国黄土区安太堡大型露天煤矿南排土场为对象，以生物水土保持措施为研究角度，研究内容包括以下4个方面： ( 1 )安太堡矿南排土场原地貌的水蚀特征和排土场新造地土壤侵蚀的形式与分布特征。
