Results 41 to 50 of about 2,562 (169)
Response of cave system to climate and eco-environment [PDF]
, 2005 从大气降水、土壤水和洞穴滴水的继承关系的角度,在对洞穴化学沉积物形成的必备因素-洞穴滴水的地球化学形成过程作逐步分析的基础上,综合讨论了洞穴体系对外界气候与生态环境的响应关系。提出对洞穴综合体系开展详尽的长期观测与研究,更加深入地揭示现在正在进行的洞穴碳酸盐沉积过程,即观测现在环境下洞穴化学沉积物的沉积过程及其对环境的响应,是洞穴化学沉积物应用于全球变化研究领域需要更加引起重视的方向。Based on the sequence relation of rain water,soil water and ...
刘启明, 王世杰
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Effects of Organic Fertilizer Substitution and Aggregation on Microfauna Communities in a Red Soil [PDF]
[Objective] Red soil is a typical soil in Southern China, and organic substitution is an important way to improve the physicochemical properties of red soil.
DING Weixin +6 more
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Shuitu Baochi Xuebao, 2003 在野外调查分析的基础上,测定了沙棘、黄刺玫、油松以及草地和农田的土壤有机质和速效养分,采用新负极差法检验了有机质含量的差异性,结果表明:(1)黄土高原半湿润地区恢复植被能够显著提高土壤的有机质含量,且草地>沙棘>黄刺玫>油松;(2)植被恢复对土壤有机质的提高效益随深度增加而明显减小,土壤有机质有一定表聚性,草地和灌木林植被下更为显著;(3)不同植被类型土壤速效氮均有大幅度增加,土壤速效磷增幅较小;土壤速效钾在草地、黄刺玫植被下有少量增加,沙棘、油松林地却有所下降。
张俊华 常庆瑞 贾科利 陈涛 岳庆玲 李云驹
doaj +2 more sources
Measurement and Evaluation of the Nutrient Situation in Soil of the Main Orchards of Putian [PDF]
, 2007 通过对莆田华亭、常太、西天尾三地果园土壤营养状况的实验测定和分析评价,初步掌握了三大名果龙眼、枇杷、荔枝生长的土壤环境质量现状与存在问题。结果表明:莆田果园土壤普遍偏酸,有机质不足;普遍严重缺氮(N)、磷(P)、钾(K),且氮、磷、钾比例失调;硼(B)、镁(Mg)、铜(Cu)、锌(Zn)元素缺乏;龙眼园和荔枝园钙(Ca)含量不足。根据实验分析结果进一步提出改良建议,为莆田果园绿色果品生产和可持续发展提出了理论依据,为果农、有关决策管理部门及科研机构提供了莆田果园土壤肥力的参考资料。Through ...
傅丽君, 曹长青, 邹俊毅
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In situ Adsorption Technology for Remediation of Cr(Ⅵ) Contaminated Soil [PDF]
The commonly used remediation technologies for Cr(Ⅵ) contaminated soil, such as guest soil, reduction, solidification, microbiology, etc., have drawbacks such as high cost, slow efficiency, and secondary oxidation of Cr(Ⅵ).
Cui CAO +8 more
core +1 more source
Shuitu Baochi Xuebao, 2002 试验和分析结果表明 ,退化红壤主要肥力因素的恢复与农用物质的投入和土壤本身理化性质均存在明显的关系。随着物质投入量的增加 ,土壤肥力质量的恢复也逐渐加快。在自然条件下 ,土壤肥力因素的恢复主要与土壤本身属性有关 ,在肥力恢复过程中 ,土壤有机质的增加量与土壤本身有机质含量呈抛物线关系 ,约当土壤有机质含量在 2 0 g/ kg时 ,增幅最大 ;在一定的含氮范围内 ,土壤氮素的增加与土壤全氮含量呈正相关 ;而速效钾的增加量与土壤本身速效钾含量呈反相关 ...
章明奎 徐建民
doaj +2 more sources
Shuitu Baochi Xuebao, 2003 风沙土有机质易于分解,难以积累,腐殖质是风沙土有机质的主体,胡敏素是腐殖质的主要成分,HA/FAD的比值在0.16～0.57,风沙土土壤全氮与有机质含量显著相关。施用氮肥可以显著增加土壤中硝态氮的含量,NO3--N含量在0～30cm,30～60cm,60～90cm和90～120cm土层的高峰分别出现在5,6,7,8月。土壤有机质的含量与施入土壤的有机肥量相关,而且随着有机肥施用量的提高,土壤有机质、全氮、NH4 -N、NO3--N、速效氮均显著增加 ...
周涛 何宝银 王波
doaj
Research on soil improvement and engineering application under mixed application of environmental materials in alpine mining areas [PDF]
To address the issues of inadequate topsoil structure, soil erosion, and low soil fertility in the reclamation of alpine mining areas. Taking Qinghai West Copper Mine as an example, this study investigates the impact of three materials—sheep manure(A ...
Jie REN +4 more
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Evaluation of the Effectiveness of Soil Improvement Measures in Apple Orchards on the Loess Plateau: A Meta-Analysis [PDF]
[Objective] Soil acidification, structure and fertility degradation and poor water-holding capacities are common problems in the apple orchard on the Loess Plateau, effective soil improvement techniques are crucial for enhancing soil quality, and ...
DUAN Shunxia +3 more
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