水稻土裂缝的演变及其还原酶活性的变化研究

在温室中对3种水稻土进行土柱培养,加水使土壤含水量充分饱和,然后土壤自然干燥。在该过程中,粘粒含量高的青紫泥和黄斑田产生了裂缝,而粘粒含量低的小粉土没有开裂。青紫泥和黄斑田在裂缝演变过程中,单位面积的总长度、最大宽度以及最大深度都遵循着一定的演变规律。裂缝的产生对于硝酸还原酶和羟胺还原酶活性的变化影响显著,但是亚硝酸还原酶活性的变化与裂缝的产生没有多大关系。在裂缝产生到稳定过程中,青紫泥和黄斑田的硝酸还原酶、亚硝酸还原酶和羟胺还原酶活性的演变规律相似。

Dynamic Change of Cracks and Reductase Activities in Paddy Fields

The soil columns incubation experiments were to add enough water to three kinds of paddy soils,then dry those soils under nature environment in a greenhous. The experiments showed Qingzini and Huangbantian with high clay content produced cracks,but Xiaofentu with low clay content didn't appear cracks. The total length, maximal width and depth of cracks in same area had similar curves between Qingzini and Huangbantian on the course of incubation. The produce of cracks had important effects on the activities of nitrate reductase and hydroxylamine reductase,except nitrite reductase. From produce to stabilization of cracks, the activities of nitrate reductase,nitrite reductase and hydroxylamine reductase changed similiarly between Qingzini and Huangbantian.