| 1 | Effects of Biochar and Super Absorbent Polymer on Substrate Properties and Water Spinach Growth显示文摘Most previous researches have focused on biochar application in agricultural soils; however, limited information is available concerning the effects of biochar amendment on greenhouse substrate properties. A greenhouse experiment was conducted to investigate effects of wheat straw biochar(0–160 m L L-1) and super absorbent polymer(SAP, 0.8 g L-1) on physical and chemical properties of a substrate based on spent pig litter compost and the growth of water spinach(Ipomoea aquatica Forsk). Total porosity, water-holding capacity, p H and electrical conductivity(EC) of the substrate significantly increased with increasing biochar rates, especially in the substrate without SAP. The values of p H and EC were significantly lower in the substrate with SAP than those without SAP at the high biochar application rates(100–160 m L L-1). The germination rates of water spinach decreased with increasing biochar rates when biochar was added alone(76.9%–83.7%), whereas the rates increased to 83.6%–85.8% when biochar was added in combination with SAP. Growth parameters of water spinach and nutrient uptake by shoots and roots increased with increasing biochar rates and reached the maximum values at the biochar rate of 100 m L L-1. There were significant cubic relationships between the uptake of nutrients(N, P, and K) and biochar rates, both with and without SAP addition. In order to avoid negative effects on plant growth,the biochar application rate should be controlled at an optimal level(100 m L L-1). The SAP addition not only enhanced the positive effects of biochar application on the properties of the substrate, but also inhibited the excessive rise of p H and EC following biochar additions, which led to better plant growth and enhanced nutrient uptakes by water spinach. | FAN Ruqin LUO Jia YAN Shaohua ZHOU Yunlai ZHANG Zhenhua | 2015 | Pedosphere2015，25，5： | 15 |
| 2 | Effects of Tillage Management on Infiltration and Preferential Flow in a Black Soil, Northeast China显示文摘The impacts of no-tillage (NT) and moldboard plough (MP) managements on infiltration rate and preferential flow were characterized using a combined technique of double-ring device and dye tracer on a black soil (Mollisols) in Northeast China. The objective of this study is to evaluate how tillage practices enhance soil water infiltration and preferential flow in favor of soil erosion control in the study area. The steady infiltration rates under NT management are 1.6 and 2.1 times as high as those under MP management in the 6th and 8th years of the tillage management in place, while the infiltrated water amounts under NT management are 1.4 and 2.0 times as high as those under MP management, respectively. The depth of methylene blue penetrated into NT soil increases from 43cm in the 6th year to 57cm in the 8th year, which are 16cm and 19cm deeper than those in MP soil, respectively. The results of morphologic image show that more biological macro-pores occur in NT soil than in MP soil. These macro-pores play a key role in enhancing preferential flow in NT soil, which in turn promotes water infiltration through preferential pathways in NT soil. The results are helpful to policy-making in popularizing NT and have the implications for tillage management in regard to soil erosion control in black soil region of China. | FAN Ruqin ZHANG Xiaoping YANG Xueming LIANG Aizhen JIA Shuxia CHEN Xuewen | 2013 | Chinese Geographical Science2013，23，3： | 6 |
您所在的机构暂未开通此部分的功能，请联系管理员