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| Abstract： In order to get clear about the effects of rice-crab co-culture on soil physical and chemical properties and soil enzyme activities, this study used ten cement pools to simulate the paddy field, and compared the differences of seven soil physical and chemical indexes and four soil enzyme activities between rice-crab co-culture and rice monoculture. [Result]The results showed that rice-crab co-culture had significant effects on soil bulk density, soil moisture content and total amount of soil reducing substances(P＜0.05) ; The total organic carbon of the rice-crab group was slightly lower than that of the paddy group, but the total nitrogen was slightly higher than that of the paddy group. There was a significant difference in Eh between the rice-crab group and the rice group, and the difference between the two groups was 20.95 %. The mechanical composition of soil particle size in rice-crab group and paddy field group was basically the same, which was silt > clay > coarse and fine sand, and the proportion of silt was more than 80 %, and there was a significant difference between the two groups ( P < 0.05 ).With the increase of soil depth, the four enzyme activities of the rice group showed a significant downward trend; the activities of urease, cellulase and sucrase in the rice-crab group were consistent with those in the rice group, showing a significant downward trend, but the acid phosphatase changed little. It can be seen that the introduction of river crabs in the rice-crab co-culture system reduced the soil bulk density, increased the soil water content, and improved the soil. The 10-15 cm bottom soil with more rice roots showed strong soil enzyme activity, which promoted the efficient use of carbon, nitrogen and other elements in the rice-crab co-culture system. [Conclusion]Therefore, the rice-crab co-culture system is not only conducive to rice growth, but also conducive to river crab breeding, which can be promoted and applied as an ecological planting and breeding model in Jiangsu Province. |
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【答案】应助回帖
| 为了了解水稻和螃蟹（稻-蟹）共育对土壤物理和化学性质（理-化性质）和土壤酶活性的影响，本研究采用10个水泥池模拟稻田，在7项土壤理化指标和4项土壤酶活性方面的差异对稻-蟹共育和水稻单作进行比较。【结果】稻蟹共培养对土壤容重、土壤含水量和土壤还原物质总量均有显著影响（P＜0.05）；稻-蟹组的总有机碳略低于水稻组，但总氮略高于水稻组。在Eh方面稻蟹组和水稻组有显著差异，差异值为20.95%。稻蟹组和稻田组土壤颗粒大小的力学组成基本相同，依次为淤泥>粘土>粗细砂和细砂，淤泥比例均在80%以上，两组之间有显著差异（P<0.05）。随着土壤深度的增加，水稻组的四种酶活性呈显著的下降趋势；稻-蟹组脲酶、纤维素酶和蔗糖酶活性与水稻组一致，呈显著下降趋势，但酸性磷酸酶变化不大。可以看出，在稻-蟹共育体系中引入河蟹降低了土壤容重，增加了土壤含水量，改善了土壤。水稻根系较多的10-15cm底层土壤表现出较强的土壤酶活性，促进了稻蟹共育体系中碳、氮等元素的高效利用。【结论】因此，稻-蟹共育体系不仅有利于水稻生长，也有利于河蟹养殖，可作为江苏省生态种养模式推广应用。 |
2楼2023-10-02 21:58:16