西藏人工造林作业区土壤养分特征研究

发布时间：2018-10-12 09:41

【摘要】：为了掌握西藏拟造林作业区的土壤养分状况,对6个地市524个造林作业区的土壤样本进行了养分测定和分析。结果表明:(1)土壤全钾、有效磷、有机质和速效钾均处在"稍缺极缺"水平:平均含量分别为6.26 g kg~(-1)、8.7 mg kg~(-1)、17.81 g kg~(-1)和83.6 mg kg~(-1),全氮和全磷处在"中等稍缺"水平:平均含量分别为1.39 g kg~(-1)和0.72 g kg~(-1),碱解氮条件最好:平均含量为214.1 mg kg~(-1),全钾条件最差。(2)6地市除碱解氮外,土壤中分别存在2至5个养分元素的缺乏,多数作业区全钾、速效钾和有效磷不足。阿里地区最缺有机质,仅5.08 g kg~(-1),日喀则市、拉萨市和林芝市最缺全钾,仅5.19~6.42 g kg~(-1),山南市和昌都市最缺有效磷,仅3.9~5.4 mg kg~(-1)。此外,拉萨市、山南市和阿里地区多数作业区全氮不足,阿里地区、日喀则市和昌都市全磷不足,除昌都市外各地市有机质不足的作业区居多。(3)地市间土壤养分含量差异显著,但速效钾、有机质在日喀则市、拉萨市和山南市间差异均不显著。总体而言,西藏造林作业区土壤养分状况较差,通过对西藏造林作业区土壤养分的特征分析,可为作业区造林后树木生长状态的成因查寻提供科学依据,为进一步提高造林质量提供基础数据。
[Abstract]:In order to understand the status of soil nutrients in the simulated afforestation areas in Tibet, the soil samples from 524 afforestation areas in 6 cities were measured and analyzed. The results showed that: (1) soil total potassium, available phosphorus, Organic matter and available potassium were at "slightly deficient" levels: average contents were 6.26 g kg~ (-1), 8.7 mg kg~ (-1), 17.81 g kg~ (-1) and 83.6 mg kg~ (-1), and total nitrogen and total phosphorus were at "moderate deficiency" level: 1.39 g kg~ (-1) and 0.72 g kg~ (-1), respectively. Kg~ (-1), alkali hydrolyzed nitrogen was the best condition: the average content was 214.1 mg kg~ (-1), and the total potassium condition was the worst. (2) 6 cities except alkali-hydrolyzed nitrogen, There were two to five nutrient elements in the soil, and the total potassium, available potassium and available phosphorus were insufficient in most operation areas. In Ali area, only 5.08 g kg~ (-1), 5.19 ~ 6.42 g kg~ (-1) were most deficient in Xigaze, Lhasa and Linzhi cities, and only 3.9 mg kg~ (-1) in Shannan and Changcheng cities. In addition, in Lhasa City, Shannan City and Ali area, the total nitrogen deficiency in most operation areas, the total phosphorus deficiency in Ali area, Xigaze City and Changcheng City, and the majority of the operation areas with insufficient organic matter except Changdu City. (3) the difference of soil nutrient content among different cities is significant. But there was no significant difference in available potassium and organic matter between Xigaze City, Lhasa City and Shannan City. In general, the soil nutrient status in afforestation areas in Tibet is poor. The analysis of the characteristics of soil nutrients in afforestation areas in Tibet can provide a scientific basis for the investigation of the causes of tree growth after afforestation in the operation areas. To further improve the quality of afforestation to provide basic data.
【作者单位】：中国林业科学研究院资源信息研究所;西藏自治区林业调查规划研究院;
【基金】：西藏自治区2016年度重点区域生态公益林建设工程项目~~
【分类号】：S714.8

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