摘要
为了揭示川西北高寒沙地生态修复过程中土壤颗粒组成和矿质养分的积累和变化特征,以川西北围栏种植红柳生态修复年限分别为0、2、4、6和8年的沙化土地作为研究对象,并结合土壤样品的采集和室内分析化验,研究了川西北沙化土地生态修复过程中土壤颗粒组成及磷、钾养分的变化特征。结果表明,生态修复过程中沙化土地0~20 cm土层土壤全磷和全钾含量略有增加,但不同生态修复年限之间土壤全磷和全钾含量差异未达显著水平(P】0.05),而20~40 cm和40~60 cm土层土壤全磷和全钾含量无明显变化特征。随着生态修复年限的增加沙化土地0~20 cm、20~40 cm和40~60 cm土层土壤黏粒、粉粒、速效磷和速效钾含量均呈现逐步增加的趋势,而土壤砂粒含量呈现出逐步下降的趋势,其中0~20 cm土层变化最为明显,生态修复8年后沙化土地粉粒、黏粒、速效磷和速效钾含量分别增加了66.67%、96.30%和109.82%、102.61%,而土壤砂粒含量减少了5.57%,不同生态修复年限沙化土地0~20 cm土层土壤砂粒、粉粒、黏粒、速效磷和速效钾含量差异均达极显著水平(P【0.01)。20~40 cm和40~60 cm土层土壤速效磷和速效钾含量增加幅度及差异显著性不及0~20 cm土层。沙化土地植被覆盖度与土壤全磷、全钾呈显著正相关关系(P【0.05),与土壤速效钾、速效磷呈极显著正相关关系(P【0.01);土壤速效磷、速效钾与土壤砂粒含量呈极显著负相关关系(P【0.01),与土壤粉粒和黏粒含量呈极显著正相关关系(P【0.01),土壤全磷、全钾含量与土壤颗粒组成相关性未达显著水平。
Fencing and planting branchy tamarisk was one of the main ecological restoration measures of desertification land in Northwestern Sichuan Province. The objectives of this research were to reveal the variation characteristics of soil mineral nutrients and soil particle compositions during the process of ecological restoration of desertification land.Soil samples were collected from the desertification lands where were ecologically restored for 0, 2, 4, 6 and 8 years,and then were measured for soil particle composition, and the contents of phosphorus and potassium. The results showed that the contents of soil total phosphorus and total potassium in 0- 20 cm soil layer had slight increases in the process of ecological restoration, and they were not significantly different(P > 0.05) between different ecological restoration years. There were not obvious variations in the contents of soil total phosphorus and total potassium in 20-40 cm and 40- 60 cm soil layer. With increasing ecological restoration years,the contents of soil sand, silt, clay,available phosphorus and available potassium gradually increased and the soil sand contents consistently decreased. In0- 20 cm soil layer, the differences in the contents of soil sand, silt, clay, available phosphorus and available potassium reached extremely significant levels(P < 0.01) between different ecological restoration years. The contents of soil silt, clay, available phosphorus, and available potassium increased by 66.67%, 96.30%, 109.82% and 102.61%,respectively, and the soil sand content decreased by 5.57% after the desertification land was ecologically restored for 8years. The variations and differences of soil particles composition, available phosphorus and available potassium were less in 20- 40 cm and 40- 60 cm soil layer than in 0- 20 cm soil layer. There were significantly positive correlations(P < 0.05) between vegetation coverage and soil total phosphorus, total potassium, and extremely significantly positive correlation(P < 0.01) between vegetation coverage and soil available phosphorus, available potassium. Soil available phosphorus and available potassium showed significantly negative correlations with soil sand content(P < 0.01), and positive correlation with silt and clay content(P < 0.01). The correlations between soil total phosphorus, total potassium and soil particles were not significant(P > 0.05).
出处
《土壤通报》
CAS
CSCD
北大核心
2015年第1期54-61,共8页
Chinese Journal of Soil Science
基金
国家科技支撑计划项目(2008BAK51B02)
四川省科技支撑计划项目(2010NZ0105)
四川省科技支撑计划项目(2013SZ0110)
四川省科技支撑计划项目(2014SZ0057)资助
关键词
川西北
沙化土地
生态恢复
土壤颗粒组成
土壤磷
土壤钾
Northwest Sichuan Province
Desertification land
Ecological restoration
Soil particle composition
Soil phosphorus
Soil potassium
