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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。
In order to reveal the characteristics of accumulation and variation of soil particle composition and mineral nutrients in the process of ecological restoration in the alpine sand land in northwestern Sichuan, Sandy Lands of Hongliu Ecological Restoration for 0, 2, 4, 6 and 8 years , Combined with the collection of soil samples and laboratory analysis, the characteristics of soil particle composition, phosphorus and potassium in the process of ecological restoration of desertified land in northwestern Sichuan were studied. The results showed that total P and total K in soil slightly increased in 0-20 cm soil layer during the ecological restoration process, but there was no significant difference between soil P and K content in different restoration years (P> 0.05) , While there was no obvious change in soil total phosphorus and total potassium content in 20 ~ 40 cm and 40 ~ 60 cm soil layers. With the increase of ecological restoration years, the contents of clay, silt, available phosphorus and available potassium in 0-20 cm, 20-40 cm and 40-60 cm soil layers of sandy land show a trend of increasing gradually, while the content of soil sands presents The soil layer 0 ~ 20 cm showed the most obvious change. After 8 years of ecological restoration, the contents of silt, clay, available phosphorus and available potassium increased by 66.67%, 96.30% and 109.82%, 102.61% , While the content of soil sand decreased by 5.57%. The content of sand, silt, clay, available phosphorus and available potassium in 0 ~ 20 cm soil layer of sandy land under different ecological restoration years reached the extremely significant level (P <0.01). Soil available phosphorus and available potassium content in 20 ~ 40 cm and 40 ~ 60 cm soil layers were less significant than those in 0 ~ 20 cm soil layer. There was a significant positive correlation between the vegetation coverage of sandy land and soil total phosphorus and total potassium (P <0.05), and soil available potassium and available phosphorus (P <0.01). Soil available phosphorus, available potassium and soil There was a significant negative correlation between sand content and sand content (P <0.01), and significant positive correlation with soil silt and clay content (P <0.01). The correlation between soil total phosphorus and total potassium content and soil particle composition was not significant Level.