典型石漠化区不同种植年限桃树下土壤微量元素变化特征

发布时间：2018-09-19 07:16

【摘要】：为明确石漠化地区不同种植年限果树根系表层土壤微量元素的变化特征,选择桂林市恭城县大岭山村同一农户的不同种植年限桃树(2a、10a、20a)各5棵,以撂荒地(0a)作为对照,对土壤微量元素铁、铜、锰、锌、硼的全量及有效态变化规律进行研究,并探讨理化性质与微量元素有效态的相关性。结果表明:(1)研究区除全铁的变异系数小于10%,铜、锰、锌、硼的全量及有效态均为中等变异;(2)土壤铁、铜、锌、硼全量种植0~2a间均增加(P0.05),种植2~10a则下降(P0.05),种植10~20a间铁元素随年限增加而下降(P0.05),其余研究元素全量均表现为增加趋势;(3)有效铁、锌、硼在种植0~10a先增加(P0.05),种植10~20a均有明显下降趋势,有效锰在0~20a间趋势则与其他元素相反,并且与全量锰保持一致性,因此种植10a是果树土壤微量元素变化的转折点;(4)不同种植年限果树根系土壤性质的改变(pH值、有机质、全磷的变化)是微量元素有效态含量随时间变化的主要内在原因,而人为活动如施加有机肥是外在原因。在种植10a后,应重视微肥的施加。
[Abstract]:In order to clarify the change characteristics of trace elements in the topsoil of root system of fruit trees with different planting years in rocky desertification area, 5 peach trees (2a10 a ~ (20) a) of the same farmer in Daling Mountain Village, Gongcheng County, Guilin City, were selected, and the abandoned land (0 a) was used as control. The changes of total amount and available state of Fe, Cu, mn, Zn and B in soil were studied, and the correlation between physical and chemical properties and available state of trace elements was discussed. The results show that: (1) the coefficient of variation of total iron in the study area is less than 10, the total amount and available state of copper, manganese, zinc and boron are all moderate variation, (2) soil iron, copper, zinc, The total amount of boron increased in 0 ~ 2 years (P0.05), decreased in 210 years (P0.05), and decreased with the increase of the number of years (P0.05). The total amount of all other research elements showed an increasing trend; (3) available iron, zinc, zinc, Boron increased at 0 ~ 10a (P0.05), and decreased significantly in 10 ~ 20a. The trend of available manganese in 0 ~ 20a was opposite to that of other elements, and was consistent with total manganese. Therefore, planting for 10 years is the turning point for the change of trace elements in fruit tree soil. (4) the change of soil properties (pH value, organic matter, total phosphorus) of root system of fruit trees with different planting years is the main internal cause of the change of available trace element content with time. Artificial activities such as the application of organic fertilizer are external reasons. After planting for 10 years, attention should be paid to the application of micro-fertilizer.
【作者单位】：桂林理工大学环境科学与工程学院;中国地质科学院岩溶地质研究所/国土资源部广西岩溶动力学重点实验室;联合国教科文组织国际岩溶研究中心;中国地质大学水资源与环境学院;
【基金】：广西科学研究与技术开发计划项目(桂科能1598023-1、桂科合14125008G2G1) 国家自然科学基金青年基金(41402326) 科技部政府间科技合作项目(10-18) 国家留学基金委资助项目(201608450017) 中国地质科学院岩溶地质研究所基本科研业务费项目(201501)
【分类号】：S153.6

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