红壤中交换性铝调控条件的研究Ⅱ.有机质和CaCO_3对交换性铝的影响

Study on the Control Conditions for Exchangeable Aluminum in Red Soils: II. Effect of Organic Matter and CaCO_3 on the Exchangeable Aluminum in Red Soils

研究了有机质和ＣａＣＯ３。对发育于花岗岩和第四纪红色粘土母质上的红壤的交换性铝的影响。结果表明，在用Ｈ２Ｏ２去除土壤中的有机质后，交换性铝的含量随有机质的降低而降低，但降低的速度不均匀，由慢到快似有一个“突跃”。而在向土壤中添加有机质的研究结果则表明，交换性铝的含量随有机质的增加而增加；在增加的过程中由快到慢，达到极点后，有机质含量再增加，交换性铝反而下降。在相同的土壤环境中，由于作物品种不同，施用等量的ＣａＣＯ３（或石灰粉）对土壤交换性铝的含量及作物产量的影响不同，而且差异显著。

This paper deals with the effect of organic matter and CaCO_3 on exchangeable aluminum in red soils developed fromparent material of granite and Quaternary red clay. The results showed that for the samples from which organic matterwere removed with H_2O_2, the amount of exchangeable aluminum decreased with the decreasing of content of organicmatter, however, the decreasing speed was not identical, it changed from slowness to rapidity and seemed to have a leap;for the samples in which organic compounds were added, the amount of exchangeable aluminum increased with theincreasing of content of organic compound, but the increasing rate changed from rapidity to slowness, and when itreached a critical point, the exchangeable aluminum decreased with the increasing of organic compound. Meanwhile,the effect of CaCO_3 (lime powder) on exchangeable aluminum of soils in which different varieties of crops were plantedwas studied. The result indicated that in the same soil environment, the same amount of CaCO_3(lime powder) produceddifferent effects on the content of exchangeable aluminum and crop yield, and the difference was remarkable, whichcould be attributed to the different varieties of crops.