从不同开垦年限、土层和地形部位三个视角,应用慢速湿润法研究了东北黑土区坡耕地表层3~5 mm土壤团聚体稳定性与有机质的关系.结果表明:黑土开垦后,随着土壤有机质含量下降,土壤团聚体水稳性也明显降低;40 a以后,随着开垦时间的延长,两者的变化逐渐趋于稳定和平缓.MWDSW值、>0.2 mm水稳定性土壤团聚体含量均与有机质含量显著正相关,相关系数分别是0.979和0.956(P0.2、>0.5 mm
【正】The online game giants anduprising entrepreneurs aref looding into the mobilegame market,according toreports on China’s mobile game marketissued in 2013
<正>The Chinese transport sector is poised to attract 2.6trillion yuan($425 billion)of investment for this year as authorities strive to accelerate infrastructu