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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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769509727
木蟲 (著名寫手)
夢海長歌
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| 為了了解水稻和螃蟹（稻-蟹）共育對(duì)土壤物理和化學(xué)性質(zhì)（理-化性質(zhì)）和土壤酶活性的影響，本研究采用10個(gè)水泥池模擬稻田，在7項(xiàng)土壤理化指標(biāo)和4項(xiàng)土壤酶活性方面的差異對(duì)稻-蟹共育和水稻單作進(jìn)行比較�！窘Y(jié)果】稻蟹共培養(yǎng)對(duì)土壤容重、土壤含水量和土壤還原物質(zhì)總量均有顯著影響（P＜0.05）；稻-蟹組的總有機(jī)碳略低于水稻組，但總氮略高于水稻組。在Eh方面稻蟹組和水稻組有顯著差異，差異值為20.95%。稻蟹組和稻田組土壤顆粒大小的力學(xué)組成基本相同，依次為淤泥>粘土>粗細(xì)砂和細(xì)砂，淤泥比例均在80%以上，兩組之間有顯著差異（P<0.05）。隨著土壤深度的增加，水稻組的四種酶活性呈顯著的下降趨勢；稻-蟹組脲酶、纖維素酶和蔗糖酶活性與水稻組一致，呈顯著下降趨勢，但酸性磷酸酶變化不大�？梢钥闯�，在稻-蟹共育體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。水稻根系較多的10-15cm底層土壤表現(xiàn)出較強(qiáng)的土壤酶活性，促進(jìn)了稻蟹共育體系中碳、氮等元素的高效利用�！窘Y(jié)論】因此，稻-蟹共育體系不僅有利于水稻生長，也有利于河蟹養(yǎng)殖，可作為江蘇省生態(tài)種養(yǎng)模式推廣應(yīng)用。 |
2樓2023-10-02 21:58:16
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