Results 11 to 20 of about 237 (145)
Shuitu Baochi Xuebao, 2020 为深入探究辽西低山丘陵区坡耕地土壤侵蚀机理，以该区的典型土壤类型褐土和棕壤为研究对象，采用室内人工降雨模拟试验，研究3种坡度（5°，10°，15°）和3种降雨强度（40，60，80 mm/h）下细沟侵蚀发生的阶段性水沙变化过程。结果表明：褐土与棕壤坡面侵蚀过程可划分为3个阶段，即细沟侵蚀之前阶段、跌坎发育阶段和细沟侵蚀快速发育阶段；细沟侵蚀之前的面蚀阶段，同一坡度条件下，褐土与棕壤随雨强的增加，坡面流速呈增大趋势，而在同一雨强条件下，坡度对流速的影响并无明显规律；细沟侵蚀阶段，当坡度一定条件下 ...
吕刚 +6 more
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Study on the Spatial and Temporal Changes of the Vegetation Cover and the Driving Factors in Panzhihua City from 1990 to 2020 [PDF]
[Objective] To investigate the spatial and temporal variations and the driving factors of the vegetation cover in Panzhihua City, and to provide a theoretical basis for Panzhihua City to formulate regional ecological environmental protection programs and
HE Shuqin +3 more
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Shuitu Baochi Xuebao, 2020 为揭示辽西低山丘陵区坡耕地典型土壤溅蚀特征，选取褐土和棕壤作为研究对象，采用人工模拟降雨试验对比研究2种土壤的溅蚀差异。结果表明：褐土和棕壤不同方向溅蚀率、净溅蚀率和总溅蚀率差异较大。不同降雨强度下，棕壤溅蚀率均随降雨历时呈现递减并趋于稳定的趋势；褐土溅蚀率随降雨历时的变化可以划分为缓慢增长阶段、迅速增长阶段、快速下降阶段和相对稳定阶段。褐土的小粒级颗粒完成迁移的降雨历时临界值与不同方向溅蚀率、净溅蚀率和总溅蚀率的降雨历时临界值-致，降雨历时为20~25 min ...
董亮 +5 more
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, 2000 本文对贵州省六个主要土类有代表性的典型土壤６８个剖面，２０４个土样中的稀土元素含量及分布进行研究，结果表明：贵州省典型土壤中稀土元素总量（２６４．４４μｇ／ｇ）高于全国土壤平均含量（１９５．７μｇ／ｇ）；各土类稀土元素的丰度都遵守Ｏｄｄｏ－Ｈａｒｋｉｎｓ法则，Ｃｅ元素富集明显。贵州典型土壤中轻稀土元素含量（１９９．０１μｇ／ｇ）亦高于全国土壤，属典型的轻稀土土壤类型；石灰土中稀土各元素含量大于其它土类 ...
严重玲 +3 more
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Effects of Continuous Straw Returning Combined with Reduced Fertilizer Application on Rice Yield and Loss of Nitrogen and Phosphorus [PDF]
, 2022 [Objective] The effects of straw returning combined with reduced chemical fertilizer application on rice yield and nitrogen and phosphorus losses with runoff were studied in order to provide a scientific basis for the recycling and reuse of local ...
Liang Fan +8 more
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Effects of Iron-Calcium and Organic Matter Matrix on Cadmium Detection in Soil by Energy Dispersive X-Ray Fluorescence Spectroscopy [PDF]
Cadmium (Cd) is a toxic and harmful heavy metal, and energy dispersive X-ray fluorescence spectroscopy (EDXRF) technology is widely used to detect Cd content in contaminated soil.
Aosong JIANG +5 more
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Shuitu Baochi Xuebao, 2007 用盆栽试验研究了外源氟对潮土、黄棕壤pH、容重、玉米干物重和吸钾量的影响,结果表明：氟可以提高土壤pH,使土壤结块,容重增加,孔隙度减少,加入氟1000 mg/kg,黄棕壤和潮土pH分别比对照增加了0.77和0.52,土壤容重分别增加了26.98%和27.72%。氟对潮土过氧化氢酶活性没有影响,加入氟600 mg/kg,氟对黄棕壤过氧化氢酶活性产生明显抑制作用;氟对黄棕壤碱性磷酸酶活性无影响,氟400 mg/kg对潮土碱性磷酸酶活性产生明显抑制。加入氟600 mg/kg,土壤中性磷酸酶活性明显降低 ...
于群英, 李粉茹, 慈恩
doaj
Shuitu Baochi Xuebao, 2007 选取三峡水库消落区典型土壤,即紫色土、黄壤、紫色潮土和灰棕潮土为研究对象,以相应土壤胶体、蒙脱石矿物的10 mg/L Cd(NO3)2淋洗液分别淋洗土柱,研究了水分散态胶体对镉在土柱中迁移的影响.添加上述胶体的镉淋洗液,在紫色土、黄壤、紫色潮土和灰棕潮土土柱中镉迁移量分别是对照的1.18～4.96,1.05～2.37,1.10～4.33,1.03～3.33倍.结果表明胶体能够促进镉离子在土层中的迁移,其迁移能力遵循紫色土胶体≥紫色潮土胶体＞灰棕潮土胶体＞蒙脱石胶体＞黄壤胶体的规律.由此得出 ...
肖广全, 温华, 魏世强
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Shuitu Baochi Xuebao, 2019 为揭示辽西低山丘陵区主要土壤类型褐土、棕壤坡耕地细沟侵蚀产流产沙变化规律，以期为该地区土壤侵蚀预测预报提供一定理论依据，利用人工模拟降雨系统在坡度为10°和15°、降雨强度为40，60，80 mm/h条件下分析褐土和棕壤2种土壤细沟侵蚀产沙过程，结果表明：褐土在坡度为10°和15°，径流量均随雨强的增加而增大，在坡度为15°雨强为80 mm/h降雨过程中出现最大值，而含沙量变化相反，大体呈现出随着雨强的增加而降低的特征，在坡度为15°时，3种降雨强度在降雨末期均集中在0.05 g/mL）棕壤在10 ...
吕刚 +6 more
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The Spatio-temporal Evolution of NDVI in the Three Gorges Reservoir Area Driven by the Synergistic Effect of two Factors over the Past 21 Years [PDF]
[Objective] To clarify the spatio-temporal characteristics of vegetation evolution in the Three Gorges Reservoir Area, and to quantitatively analyze the relationships between vegetation and key determinants, including climate, terrain, and human ...
LI Cheng +5 more
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