检索结果-南通市图书馆

chinese Science Bulletin 1999年第S2期44卷 125-126页

作者： BAI Zhanguo~(1,2. and WAN Guojiang~1 1. state key Laboratory of Environmental Geochemistry, Institute of Geochemistry, {2. academy of sciences, Guiyang 550002. china 2. state key Laboratory of plant nutrition research of {2. {{12. of agriculture Institute of soil and fertilizer, chinese academy of agricultural sciences, beijing 100081, china

WEST Yunnan and central Guizhou with variable altitudes and similar latitudes, located in the Yunnan-Guizhou Plateau of the eastern slope uplifting Himalayas, were selected as study areas in this note. Thetwo areas consist mainly of carbonate rocks discontinuously covered by similar soil types with severe soiland water loss except Lugu Lake catchment. Climate of the study areas is subtropical monsoon, apparently influenced by mingled southeastern monsoon and southwestern monsoon with abundant *** study is to comparatively describe distribution and inventory of 7Be and 137Cs in the sediments of Erhai Lake, Lugu Lake and Hongfeng Lake as well as in 2. surface soil profiles of their *** results have shown that: （i） In all the soil profiles, 7Be activities decrease exponentially with soil depth. 7Be apparent ac-

关键词： radionuclides soils sediments china.

Estimation of Sand Transportation Rate for Fixed and Semi-Fixed Dunes Using Meteorological Wind Data

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2009年第1期19卷 129-136页

作者： HU Xia LIU Lian-You LI Shun-Jiang XIAO Bi-Lin LIU Mu-Xin key Lab of Environment Change and Natural Disaster Ministry of Education Beijing Normal Univeristy Beijing 100875 （China） academy of Disaster Reduction and Emergency Management Ministry of Civil Affairs/Ministry of Education Beijing Normal University Beijing 100875 （China） state key Laboratory of {2. and Sustainable agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 21008 （China） Institute of plant nutrition and Resources Beijing Academy of Agriculture and Forestry Sciences Beijing 100097 （China） Institute of agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 （China）

Taibus County, Inner Mongolia, china, lies in a farming-pastoral ecotone, where severe wind erosion and various aeolian sand hazards are prevalent and fixed and semi-fixed sand dunes occur frequently. This study was conducted to investigate the relationships between sand transportation rate and wind speed for the fixed and semi-fixed sand dunes based on field measurements. The annual quantity of soil erosion by wind was estimated using meteorological wind data. The results indicated that the sand transportation rate in Taibus County in 2.00 was 57.38 kg cm-1 year-1 for the semi-fixed dunes and 4.56 kg cm-1 year-1 for the fixed dunes. The total duration of erosive winds covered {2.5% of the time of the year, and spring posed the highest potential of sand transportation. Wind with low speed (≤ 17 m s-1) and high frequency plays a dominant role in sand transportation, while strong wind (≥ 17 m s-1) with low frequency significantly enhanced the sand transportation. Erosive wind speed, directions, and frequency were three crucial dynamic factors influencing sand hazards in the farming-pastoral ecotone. The dominant factors intensifying sand and dust storms in Taibus County might be related to the favorable wind condition in combination with the durable drought, which led to land desertification and vegetation degradation.

关键词：中国内蒙古土壤沙漠化土壤腐蚀

Geochemical records of carbon in recent sediments of Erhai Lake, china: Implication of effects of the Himalayas uplift on global environmental changes

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 1999年第S2期44卷 123-124页

作者： WAN Guojiang~1, BAI Zhanguo~(1,2., WANG Haoran~1 and HUANG Ronggui~1 1. state key Laboratory of Environmental Geochemistry, Institute of Geochemistry, {2. academy of sciences, Guiyang 550002. china 2. state key Laboratory of plant nutrition research of {2. {{12. of agriculture, Institute of soil and fertilizer, chinese academy of agricultural sciences, beijing 100081, china

THE formation and uplift of the Himalayas and the Tibetan Plateau may have been responsible for the past150 Ma global environmental changes, resulting in the development of a three-tiered landform in southernchina. The Yunnan-Guizhou Plateau, as the middle tier in eastern slope of the Himalayas, has beencomplex environmental unit with great altitude gradients and plateau landform characters. Both monsoonsfrom the Pacific and the Indian resulting in apparent environmental changes on variable time scales influence it. Environmental geochemical effect of low latitude-high altitude could be yielded, and well recorded in the geological bodies in this region. To build and verify a quantitative model of environmental evolution it is necessary to obtain high-resolution data of elemental cycles and mass equilibrium.

关键词： records sediments Erhai Lake Himalayas uplift global environmental changes.

Denitrification Losses and N_2. Emissions from Nitrogen fertilizer Applied to a Vegetable Field

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2006年第3期16卷 390-397页

作者： CAO Bing He Fa-Yun Xu Qiu-Ming Yin Bin CAI Gui-Xin state key laboratory of {2. and Sustainable agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 （China） Graduate School of the chinese academy of {2. Beijing 100039 （China） Institute of plant nutrition and Resources Beijing Academy of Agricultural and Forestry Sciences Beijing 100089 （China）

A field experiment was conducted on chinese cabbage (Brassica campestris L. ssp. pekinensis (Lour.) Olsson) in a Nanjing suburb in 2.03. The experiment included 4 treatments in a randomized complete block design with 3 replicates: zero chemical fertilizer N (CK); urea at rates of 300 kg N ha-1 (U300) and 600 kg N ha-1 (U600), both as basal and two topdressings; and polymer-coated urea at a rate of 180 kg N ha-1 (PCU180) as a basal application. The acetylene inhibition technique was used to measure denitrification (N2.N2.) from intact {2. cores and N2. emissions in the absence of acetylene. Results showed that compared to CK total denitrification losses were significantly greater (P≤0.05) in the PCU180, U300, and U600 treatments, while N2. emissions in the U300 and U600 treatments were significantly higher (P≤0.05) than CK. In the U300 and U600 treatments peaks of denitrification and N2. emission were usually observed after N application. In the polymer-coated urea treatment (PCU180) during the period 2. to 40 days after transplanting, higher denitrification rates and N2. fluxes occurred. Compared with urea, polymer-coated urea did not show any effect on reducing denitrification losses and N2. emissions in terms of percentage of applied N. As temperature gradually decreased from transplanting to harvest, denitrification rates and N2. emissions tended to decrease. A significant (P≤0.01) positive correlation occurred between denitrification (r = 0.872. or N2. emission (r = 0.781) flux densities and {2. temperature in the CK treatment with a stable nitrate content during the whole growing season.

关键词：氮肥蔬菜生长速度施肥技术

Response of Rice Varieties to Bound Residues of Metsulfuron-Methyl in a Paddy soil

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2007年第4期17卷 487-492页

作者： LI Zhao-Jun WANG Hai-Zhen XU Jian-Ming WU Jian-Jun MA Guo-Rui Institute of soil and Water Resources and Environmental Science Zhejiang University Hangzhou 310029 （China）. Institute of agricultural Resources and Regional Planning Ministry of Agriculture Key Laboratory of Plant Nutrition and Nutrient Cycling Chinese Academy of Agricultural Sciences Beijing 100081 （China）

Metsulfuron 甲基是广泛地使用的 sulfonylurea 除草剂之一。然而，近似，应用 metsulfuron 甲基的一半可以是在土壤绑了残余留下。为了描绘大米的反应，到在土壤， acetolactate synthase (ALS ) 的活动，超级氧化物 dismutase (草皮)... 详细信息

Metsulfuron 甲基是广泛地使用的 sulfonylurea 除草剂之一。然而，近似，应用 metsulfuron 甲基的一半可以是在土壤绑了残余留下。为了描绘大米的反应，到在土壤， acetolactate synthase (ALS ) 的活动，超级氧化物 dismutase (草皮) ，过氧化物酶(邮政部门) ，和过氧化氢酶(猫) 的剩余 metsulfuron 甲基的植物在在危险性不同到除草剂的二个大米变化被调查。在在 Xiushui 63 的叶子和根的这些酶的活动的变化，一个敏感米饭变化，比在抗性品种 Zhenong 952.的那些大。不管变化，在酶活动的变化比在叶子在根是更大的。ALS 和猫的活动减少了，当 SOD 活动随土壤的 metsulfuron 甲基(BRM ) 的界限残余的数量的增加增加了时。邮政部门活动在 0.02. mg kg 的 BRM 水平增加了 ? 1，但是在 0.05 mg kg 的 BRM 水平减少了 ? 1。结果证明 sulfonylurea 除草剂的界限残余可以影响米饭植物的新陈代谢。

关键词：水稻土乙酰乳酸酶活性过氧化酶土壤学

在线全文

学校读者我要写书评

暂无评论

中国菌根研究60年：过去、现在和将来

中国科学：生命科学 2012年第12期42卷 431-454页

作者：何新华段英华陈应龙徐明岗云南师范大学生命科学学院昆明650092 中国农业科学院农业资源与农业区划研究所农业部作物营养与施肥重点开放实验室北京100081 state Centre of Excellence for Ecohydrology School of Natural ResourcesEdith Cowan UniversityJoondalupWA 6027 School of plant Biology University of Western AustraliaCrawleyWA 6009Australia School of Earth and Environment University of Westem AustraliaCrawleyWA 6009Australia

菌根(真菌根系)存在于大约90%的植物中,在促进土壤结构、植物养分与生长、元素生物地球化学循环和陆地生态系统结构与功能等方面具有重要作用.过去60年尤其是近30年,中国菌根研究成果举世瞩目,如共鉴定出2.种新种与12.余种新记录种丛枝... 详细信息

菌根(真菌根系)存在于大约90%的植物中,在促进土壤结构、植物养分与生长、元素生物地球化学循环和陆地生态系统结构与功能等方面具有重要作用.过去60年尤其是近30年,中国菌根研究成果举世瞩目,如共鉴定出2.种新种与12.余种新记录种丛枝菌根真菌、30种新种与800余种新记录种外生菌根真菌以及10种新种与100余种新记录种兰花菌根真菌.同时,在菌根真菌菌种丰富度与遗传结构、菌种生态分布与植物种群,植物养分摄取与生长、植物修复与土地复垦、植物抗病性和与其他土壤微生物相互作用、菌根植物酶学性质及大气CO2.O3浓度升高对丛枝菌根多样性的影响等方面也取得重大进展.本文选介中国菌根主要研究成就,进行研究前景展望,以促进我国菌根研究的深入开展.

关键词：中国丛枝菌根外生菌根兰花菌根菌根生理和生态功能植物修复物种多样性国际合作

First report of hop latent viroid（HLVd） in commercial hop in Xinjiang,china

在线全文

学校读者我要写书评

暂无评论

First report of hop latent viroid（HLVd） in commercial hop ...

兽用抗生素在土壤环境中的行为及其生态毒理效应研究进展

中国植物保护学会2.07年学术年会

作者： Shengxue LIU~1 Shifang LI~(2.*) Jianbo ZHU~1 Benchun XIANG~(1,3) Lianpu CAO~(1,3***) (1 The key Oasis Eco-agriculture Laboratory of Xinjiang Production and Construction Group Shihezi 832.03,{2. 2.state key Laboratory of Biology of plant Diseases and Insect Pests,Institute of plant Protection,chinese academy of agricultural sciences beijing 100094,{2. 3 College of agriculture,Shihezi University Shihezi 832.03,{2.)

＜正＞Xinjiang is the primary region of hop（humulus lupulus）production in china due to high quality and productivity promoted by the favorable climate,geography and soil *** latent viroid（HLVd）does not cause any obvious symptoms in hop but results in a serious decrease in the content of alpha acid,an important characteristic for use in the beer industry.(Matou（?）ek J et

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

生态毒理学报 2008年第1期3卷 15-20页

作者：李兆君姚志鹏张杰梁永超中国农业科学院农业资源与农业区划研究所农业部植物营养与养分循环重点实验室南京农业大学资源与环境科学学院中国农业科学院农业资源与农业区划研究所农业部植物营养与养分循环重点实验室北京100081 南京2.0095

目前全球至少有70%左右的抗生素被用于畜牧业和水产养殖业,这些抗生素大多不能被动物完全吸收,以母体或代谢物的形式排出动物体外的抗生素约占用药量的40～90%,排出体外的抗生素大多随粪便等进入环境尤其是土壤环境中并在其中累积.为了... 详细信息

目前全球至少有70%左右的抗生素被用于畜牧业和水产养殖业,这些抗生素大多不能被动物完全吸收,以母体或代谢物的形式排出动物体外的抗生素约占用药量的40～90%,排出体外的抗生素大多随粪便等进入环境尤其是土壤环境中并在其中累积.为了明确兽用抗生素对环境中生物等的影响,合理评价兽用抗生素的环境风险,论文就土壤环境中兽用抗生素的来源,兽用抗生素在土壤环境中的吸附、迁移、降解以及对环境中生物的影响等方面进行了综述,在此基础上提出了今后的重点研究方向.

关键词：兽用抗生素土壤环境行为生态毒性