三峡库区水位消涨对杉木溪消落带土壤性质的影响

发布时间：2018-06-08 18:39

本文选题：消落带 + 土壤养分　；参考：《水生态学杂志》2016年03期

【摘要】：为了准确揭示杉木溪消落带土壤养分及其空间分布对三峡库区水位消涨及其所带来的环境变化的响应,2014年研究了5个完整水位消涨周期的不同海拔梯度和土层深度土壤。沿海拔梯度分别在150、155、160、165、170、175 m处各设置1个样带,180 m处设置1个对照样带,每样带设置5个样方,在各样方内选取4个角及中心点共5个样点,用土壤采集器分别在0~5、5~10和10~15 cm土层分层采集土样。结果表明,在水位消涨的作用下,消落带土壤养分含量显著下降,有机质、全氮和全磷含量与非消落带土壤相比分别减少了14.55%、20.00%和26.12%,土壤p H值则显著增加。水位消涨还导致消落带土壤养分随海拔梯度呈显著的空间变化。其中,有机质、全氮和全钾含量以中部消落带土壤的含量最高,全磷含量则以中下部消落带土壤的含量最高,而土壤p H值随着海拔梯度的减少而增加。消落带和非消落带土壤养分在不同土层之间有着显著差异,有机质、全氮、全磷含量随土壤的加深而显著减少。在水位消涨的影响下,消落带表层土与下层土有机质和全氮含量的差异显著减少,而全磷和全钾含量的差异则有所增加。
[Abstract]:In order to accurately reveal the response of soil nutrients and their spatial distribution in the Cunninghamia lanceolata to the water level decline and its environmental changes in the three Gorges Reservoir area, the different elevation gradients and soil depth of five intact water extinction cycles were studied in 2014. A pair of stripes were set up at 150155160165170175 m each in the coastal pull gradient, and 5 samples were set up in each transect, and 4 angles and 5 central points were selected from each side. Soil samples were collected with soil collector in layers of 0 ~ 5 ~ 5 ~ 5 ~ 5 ~ 10 ~ 10 and 10 ~ 15 ~ 15 cm soil layer, respectively. The results showed that under the action of water level decrease, the soil nutrient content in the zone decreased significantly, the contents of organic matter, total nitrogen and total phosphorus decreased by 14.55% and 26.12%, respectively, and the pH value of soil increased significantly compared with the non-decaying zone soil. The decrease of water level also resulted in significant spatial variation of soil nutrients with elevation gradient. The contents of organic matter, total nitrogen and total potassium were the highest in the middle zone, and the content of total phosphorus was the highest in the middle and lower part of the zone, and the pH value of the soil increased with the decrease of the altitude gradient. There were significant differences in soil nutrients between different soil layers, and the contents of organic matter, total nitrogen and total phosphorus decreased significantly with the deepening of soil. Under the influence of water level rising, the difference of organic matter and total nitrogen content between the topsoil and the lower soil in the zone decreased significantly, while the difference between total phosphorus and total potassium content increased.
【作者单位】：三峡地区生态保护与治理国际合作研究中心三峡大学;三峡库区生态与环境教育部工程研究中心三峡大学;
【基金】：反季节消涨节律扰动下土壤种子库对消落带植被生态恢复的作用机制(51379105),国家自然科学基金三峡大学研究生科学创新基金(2015CX134)
【分类号】：S714

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