XING Xuegang1,2,3, PENG Tao1,2, WANG Shijie1,2,CAI Xianli1,2, OUYANG Ziyuan1, ZHANG Xinbao4, MENG Fande1,2, ZHANG Lin1,2
(1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
2. University of the Chinese Academy of Sciences, Beijing 100049, China;
3. Puding Karst Ecosystem Research Station, Institute of Geochemistry, CAS, Guiyang 562100, China;
4. Institute of Mountain Hazards and Environment (IMHE), Chinese Academy of Sciences, Chengdu, 610041, China)
Abstract: Considered that dolomite soil have serious water and fertilizer leakage problems, this paper carried out field study on the dolomite slope soil using water retaining agent and activated carbon, aimed to discuss the significance of these two kinds of soil conditioners, which have a great effect on physical and chemical properties of dolomite soil, water erosion, nutrient leaching, and perennial ryegrass growth. Results show as in the following three aspects. (1) Using absorbent agent can effectively solve the problem of karst area soil "water leakage" through improving soil physical and chemical properties, increasing soil available water, and enhancing the ability of plant drought resistance. When the content of absorbent agent is 0.5%, the total biomass will increase 15.71% comparing with the treatment which do not adding absorbent agent, while its content up to 1%, the total biomass can increase to 22.79%. (2) Using activated carbon can significantly solve the problem of karst area soil "fertilizer leakage" by promoting soil available nutrients, and raising the crop yields. The total biomass increases 42.55% when adding 3% of activated carbon, and the total biomass increases 64.76% when the content adding up to 5%.(3) The optimal proportion is 1% of absorbent agent and 5% of activated carbon. A conclusion could be drown that above two soil amendments can evidently reduce the leakage water, improve physical and chemical properties, increase soil water content, the ability of plant available nutrients, and the yield of perennial ryegrass, and furthermore, resolve the problem of karst area soil “water leakage” and “fertilizer leakage”.
Keywords: karst; dolomite; soil amendment; pot experiment; water retaining agent; activated carbon
EARTH AND ENVIRONMENT Vol.45, No.2, Tot No.316, 2017, Page 229-235
