黄土高原风蚀水蚀交错区藓结皮的土壤酶活性特征及其与土壤养分的关系
发布时间：2018-09-10 16:07
【摘要】：促进土壤酶活性是黄土高原生物结皮改善土壤养分状况的重要途径,但目前认识不够深入。本文以陕北风蚀水蚀交错区黄绵土和风沙土上发育约30年的典型藓结皮为对象,通过分层(0—12 cm)取样,测定并分析了不同土层的水解酶和氧化还原酶活性及其与土壤理化性质的关系,以期进一步揭示藓结皮对土壤酶活性的影响及其对土壤养分的贡献,研究结果如下:(1)研究表明,藓结皮的发育能显著提高土壤酶活性。与无结皮相比,黄绵土上藓结皮的脲酶、碱性磷酸酶、蔗糖酶和蛋白酶活性分别增加了92.4%、110.4%、119.9%和83.0%,而风沙土上藓结皮的4种水解酶活性分别增加了11.2%、50.5%、199.6%和21.4%;黄绵土上藓结皮的过氧化氢酶、过氧化物酶和多酚氧化酶活性分别是无结皮的2.27、15.13和5.32倍,而风沙土上的3种氧化还原酶活性则分别是无结皮的2.04、18.58和8.68倍。(2)黄绵土和风沙土上藓结皮的体积含水量分别降低了6.5%和0.8%,温度分别降低了2.1℃和3.3℃,表明藓结皮对土壤水分和温度的重新分配有重要意义。(3)研究表明,藓结皮的发育能有效提升土壤碳含量。黄绵土上藓结皮土壤的有机质、易氧化碳和微生物量碳含量分别提升了1.59、5.79和4.96倍;风沙土上则分别提升1.29、3.16和4.69倍,藓结皮的发育在加速土壤碳循环过程中有重要作用。(4)研究发现,藓结皮的发育能有效提升土壤氮含量。黄绵土上藓结皮的全氮、速效氮和微生物量氮分别提升了2.50、2.08和3.04倍;风沙土上则分别提升了3.29、2.15和2.29倍,藓结皮的发育有利于促进土壤氮积累。(5)研究认为,藓结皮的发育能有效提升土壤磷含量。黄绵土上藓结皮的全磷和速效磷含量分别提升了2.31和2.87倍;风沙土上则分别提升了1.78和5.28倍,藓结皮发育对于提升土壤磷的有效性具有促进作用。(6)研究表明,藓结皮加强了加强了土壤酶活性与土壤养分的相关性,土壤酶对土壤养分存在积极意义。研究证实,黄土高原风蚀水蚀交错区两种土壤上藓结皮均能显著提升土壤酶活性,这可能是藓结皮加速土壤养分积累和提升土壤肥力的重要原因;其中,通过改变土壤含水量和温度等酶促反应条件间接影响酶活性,是藓结皮促进土壤酶活性的重要途径。
[Abstract]:Promoting soil enzyme activity is an important way to improve soil nutrient status by biological crust in Loess Plateau, but it is not well understood at present. In this paper, the typical mossy crust developed for about 30 years on the loess spongy soil and aeolian sandy soil in the wind-erosion water erosion interlaced area of Northern Shaanxi is taken as the object, and the samples are taken by stratification (0-12 cm). The activities of hydrolases and redox enzymes in different soil layers and their relationship with soil physical and chemical properties were determined and analyzed in order to further reveal the effect of moss crust on soil enzyme activity and its contribution to soil nutrients. The results are as follows: (1) the results showed that The development of moss crust can increase soil enzyme activity significantly. The urease, alkaline phosphatase, and alkaline phosphatase of the moss crust on yellow spongy soil. The activities of sucrase and protease increased by 92.4%, 119.9% and 83.0%, respectively, while the activities of four hydrolases in the crust of moss on the sandy soil increased by 11.2%, 50.5%, 199.6% and 21.4%, respectively. The activities of peroxidase and polyphenol oxidase were 2.27g / 15.13 and 5.32 times higher than those of non-crusts, respectively. However, the activities of three redox enzymes in windy sandy soil were 2.04 ~ 18.58 and 8.68 times as much as those in no crust, respectively. (2) the volume water content of moss crust was decreased by 6.5% and 0.8%, respectively, and the temperature was decreased by 2.1 鈩，
本文编号：2234943
[Abstract]:Promoting soil enzyme activity is an important way to improve soil nutrient status by biological crust in Loess Plateau, but it is not well understood at present. In this paper, the typical mossy crust developed for about 30 years on the loess spongy soil and aeolian sandy soil in the wind-erosion water erosion interlaced area of Northern Shaanxi is taken as the object, and the samples are taken by stratification (0-12 cm). The activities of hydrolases and redox enzymes in different soil layers and their relationship with soil physical and chemical properties were determined and analyzed in order to further reveal the effect of moss crust on soil enzyme activity and its contribution to soil nutrients. The results are as follows: (1) the results showed that The development of moss crust can increase soil enzyme activity significantly. The urease, alkaline phosphatase, and alkaline phosphatase of the moss crust on yellow spongy soil. The activities of sucrase and protease increased by 92.4%, 119.9% and 83.0%, respectively, while the activities of four hydrolases in the crust of moss on the sandy soil increased by 11.2%, 50.5%, 199.6% and 21.4%, respectively. The activities of peroxidase and polyphenol oxidase were 2.27g / 15.13 and 5.32 times higher than those of non-crusts, respectively. However, the activities of three redox enzymes in windy sandy soil were 2.04 ~ 18.58 and 8.68 times as much as those in no crust, respectively. (2) the volume water content of moss crust was decreased by 6.5% and 0.8%, respectively, and the temperature was decreased by 2.1 鈩，
本文编号：2234943
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