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辽宁章古台地区不同年龄樟子松固沙林对土壤pH值的影响

雷泽勇1*,白津宁1,周凤艳2,于东伟1,李尧1   

  1. 1辽宁工程技术大学环境科学与工程学院, 辽宁阜新 123000; 2辽宁省沙地治理与利用研究所, 辽宁阜新 123000)
  • 出版日期:2019-11-10 发布日期:2019-11-10

Effects of Pinus sylvestris var.mongolicasand fixation plantations with different ages on soil pH in Zhanggutai, Liaoning Province.

LEI Ze-yong1*, BAI Jin-ning1, ZHOU Feng-yan2, YU Dong-wei1, LI Yao1   

  1. (1College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China; 2Liaoning Institute of Sandy Land Control and Utilization, Fuxin 123000, Liaoning, China).
  • Online:2019-11-10 Published:2019-11-10

摘要: 营造樟子松人工林是沙地治理的一项重要措施,而造林后林分的生长一般会引起土壤pH值的变化,但营造樟子松固沙林后引起的土壤pH变化却并没有引起关注。以辽宁省章古台不同林龄樟子松固沙林(幼龄林、中龄林、成熟林和过熟林)为对象,研究了营造樟子松林后不同发育阶段0~100 cm土层土壤pH值的变化及其影响因子。结果表明:(1)沙地营造樟子松人工林后,pH值的变化范围由对照草地的两个层次(0~10或0~20、20~100 cm)扩大为3个层次(0~10或0~20、20~40、40~100 cm)。(2)随人工林林龄的增加,0~20 cm层pH值显著降低,20~40 cm层保持不变,40~100 cm层幼龄林、成熟林显著高于过熟林,而过熟林与草地无显著差异。(3)樟子松人工林中,0~10 cm层,pH值与土壤全钾(TK)呈显著正相关,与土壤有效磷(AP)呈显著负相关,10~20 cm层,与土壤有效钾(AK)和土壤有机碳(SOC)呈显著负相关,而与土壤含水率(SW)呈显著正相关,20~40、40~60、60~80 cm层,分别与土壤碱解氮(AN)、土壤全氮(TN)、土壤全磷(TP)呈显著正相关。樟子松林处于幼龄林时,pH值在20~40和60~80 cm层分别与C/P和AN、土壤容重(BD)呈显著正相关,而在80~100 cm层与N/P呈负相关;中龄林时,pH值在10~20 cm层与C/P呈显著负相关,20~40和40~60 cm层分别与粒径<0.05 mm的黏粉粒含量(FS)和TN呈显著正相关;成熟林时,pH值在0~10 cm层与BD、AP呈极显著正相关,与SW、AK、FS呈显著正相关,20~40 cm层与TN呈正相关,在60~100 cm层与C/N呈负相关;过熟林时,pH值在0~10 cm层与AN呈显著正相关,与TK呈显著负相关,10~20 cm层与TN呈显著正相关。

关键词: 川陕哲罗鲑, 方案优化, 环境DNA分析

Abstract: Establishment of Pinus sylvestris var.mongolica plantations is an important strategy to control desertification. Afforestation generally changes soil pH. However, changes in soil pH caused by the establishment of P. sylvestris var. mongolica sandfixing forests are not well documented. In this study, we measured soil pH (0-100 cm soil layer) in P. sylvestris var. mongolica forests at different developmental stages (young, middleaged, mature, and overmature) in Zhanggutai of Liaoning Province. The results showed that the range of pH values shifted from two levels (0-10 or 0-20, 20-100 cm) to three levels (0-10 or 0-20, 20-40, 40-100 cm). With the increases of stand age, soil pH decreased significantly in 0-20 cm layer, and kept unchanged in 20-40 cm layer. Soil pH in 40-100 cm layer of young and mature forests were significantly higher than that of over-mature forests, while there was no significant difference between over-mature forests and grasslands. Soil pH was significantly positively related to total K content and negatively related to available P content in 0-10 cm soil layer. There was a significant negative correlation between soil pH and available K and soil organic C contents, a positive correlation with soil water content in 10-20 cm layer, and positive correlations with available N, total N and total P contents in 20-40, 40-60, 60-80 cm soil layers. In young forests, soil pH was positively correlated with C/P ratio, available N, bulk density in 20-40 and 60-80 cm layers, respectively, and negatively correlated with N/P ratio in 80-100 cm layer. In middleaged forests, soil pH was negatively correlated with C/P ratio in 10-20 cm layer, and positively correlated with FS (the sum percentage of clay (<0.002 mm) and silt (0.002-0.05 mm)) and total N content in 20-40 cm and 40-60 cm layers, respectively. In mature forests, soil pH of 0-10 cm layer was significantly positively correlated with soil bulk density and available P, and positively related to soil moisture, available K and FS. Soil pH was positively correlated with total N in 20-40 cm layer and negatively correlated with C/N ratio in 60-100 cm layer. In over-mature forests, soil pH was positively correlated with available N in 0-10 cm layer, while negatively correlated with total K. There was a positive correlation between soil pH and total N in 10-20 cm layer.

Key words: eDNA analysis, protocol optimization., Hucho bleekeri