Cui Juan, Tian Xiao-Hong, Lu Xin-Chun, Ren Si-Chao, Dai Er-Zhan
Key Laboratory of plant Nutrition and the Agri-enivronment in Northwest China, College of Resources and Environment, Northwest A & F University, Yangling 712100, Shaanxi, China.
Ying Yong Sheng Tai Xue Bao. 2011 Dec;22(12):3221-6.
Maize straws were put into nylon mash bags and buried in a calcareous soil to study the effects of returning maize straw into field on the calcareous soil Zn forms and their availability. Compared with Zn fertilization, returning maize straw into field had little contribution to the soil total Zn content. Both Zn fertilization and straw returning increased the soil DTPA-Zn content significantly, and the increment was larger under Zn fertilization. As compared to that in low Zn concentration straw, the Zn released from high Zn concentration straw after returned into soil was more easily transformed into soil DTPA-Zn, with the transformation rate reached 49.0%. The transformation rate of soil DTPA-Zn had a trend of decreasing first and increasing then after straw returned into soil, but had little change under Zn fertilization. The soil exchangeable Zn (Ex-Zn), carbonate bound Zn (Carb-Zn), manganese oxide bound Zn (OxMn-Zn), tightly organic bound Zn (Sbo-Zn), and mineral Zn (Min-Zn) contents had no significant differences among the treatments, but the soil weakly organic bound Zn (Wbo-Zn) content was significantly higher under Zn fertilization, compared with the treatments control and straw addition alone. It was considered that the Zn in maize straw could be easily transformed into soil DTPA-Zn, though the Zn concentration in straw was rather low. Therefore, Zn fertilization combined with returning maize straw into filed could be an effective way to improve the Zn supply capacity of calcareous soil.
将玉米秸秆装入尼龙网袋并埋入石灰性土壤中，以研究玉米秸秆还田对石灰性土壤锌形态及其有效性的影响。与施锌相比，玉米秸秆还田对土壤全锌含量的贡献较小。施锌和秸秆还田均显著增加了土壤有效锌（DTPA-Zn）含量，且施锌处理下的增幅更大。与低锌浓度秸秆相比，高锌浓度秸秆还田后释放出的锌更易转化为土壤有效锌，转化率达49.0%。秸秆还田后土壤有效锌的转化率呈先降低后升高的趋势，但施锌处理下变化不大。各处理间土壤交换性锌（Ex-Zn）、碳酸盐结合态锌（Carb-Zn）、氧化锰结合态锌（OxMn-Zn）、紧有机结合态锌（Sbo-Zn）和矿物态锌（Min-Zn）含量无显著差异，但与对照处理和单独秸秆添加处理相比，施锌处理下土壤弱有机结合态锌（Wbo-Zn）含量显著更高。研究认为，尽管秸秆中的锌浓度较低，但玉米秸秆中的锌可较易转化为土壤有效锌。因此，施锌与玉米秸秆还田相结合可能是提高石灰性土壤锌供应能力的有效途径。
