Subjects: Biology >> Botany >> Applied botany submitted time 2018-07-23 Cooperative journals: 《广西植物》
Abstract： As the aging and degradation of Zanthoxylum planispimum var. dintanensis has affected the rocky desertification control, and in order to discuss the reason of aging and degradation of Zanthoxylum planispimum var. dintanensis, and realize the stabilization of forest stand and sustainable management, this paper took aging degraded plants with typical symbol of yellow blooms and normally grown plants as the research objects and adopted soil agrochemistry and environmental mineralogy methods to analyze mineral element content in root-zone soil of different plants, evaluate integrated soil quality and to reveal the mineral element mechanism of aging and degradation of Zanthoxylum planispimum var. dintanensis. The results shows that (1) C, P, K, S, Se, Sr, Mo and oxide in root-zone soil of normally grown plants were generally higher than the content in aging degraded plants, while total nitrogen, rapidly available phosphorus, available nitrogen, Cu, Pb, Zn and Cr had no significant difference, and other elements had no obvious change rule. It indicates that mineral elements are one of the causes of the aging and degradation of Zanthoxylum planispimum var. dintanensis. Available contents of elements also had an impact on plant growth, which indicates that we should improve availability of nutrients when managing the Zanthoxylum planispimum var. dintanensis. From the perspective of plant nutrition demand, all major, medium and micro elements had a dominant effect on soil quality. In the management of soil fertility, we should not only focus on a large number of elements. (2) Root-zone soil quality indexes manifested that the highest plant was No. 3 normally grown plant and the lowest plant was No. 1 aging degraded plant, suggesting that soil quality influences the aging and degradation of Zanthoxylum planispimum var. dintanensis. But the soil quality is not the only cause of aging degradation of Zanthoxylum planispimum var. dintanensis, and more comparative studies of soil microbes and plant hormones should be conducted. (3) When managing the Zanthoxylum planispimum var. dintanensis in forest stand, cultivate good soil structure, make sure the comprehensiveness and proportionality of soil nutrient, and pay attention to deficit effect caused by low mineral elements, and it is necessary to make sure the appropriate nutrient concentration and ratio to increase the absorption capacity of the plant.
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