三峡水库峡谷地貌区消落带土壤氮磷钾、有机质含量和pH值的时空动态
发布时间：2018-09-12 12:27
【摘要】：基于三峡水库巫山段和秭归段消落带海拔155~172 m区段经历水库水位涨落前(2008年)和经历1次(2009年)、4次(2012年)、7次(2015年)水库水位涨落后土壤化学性质的长期定位监测,研究峡谷地貌区消落带土壤氮(N)、磷(P)、钾(K)、有机质(OM)含量和p H值的时空动态变化规律,并对其养分状态进行评价.结果表明:随着经历水库水位涨落次数的增多,消落带土壤全氮(TN)、速效氮(AN)、速效钾(AK)和OM含量减少,全磷(TP)、全钾(TK)、速效磷(AP)含量和p H值增加;经历水库水位涨落前和经历1次水库水位涨落后,消落带各土层的TP、TK和AP含量为巫山样地秭归样地,经历4次和7次水库水位涨落后,变为秭归样地巫山样地;随着经历水库水位涨落次数的增多,消落带大多数土壤化学指标含量在土层间的差异减小.对照全国第二次土壤普查养分分级标准,经历7次水库水位涨落后,秭归样地土壤TP和AP含量达到极高等级,巫山样地土壤AP含量为高等级,其他指标为中等及以下等级.三峡水库的水文特征、人为活动的干扰,以及不同土壤化学指标性质的差异,是峡谷地貌区消落带土壤N、P、K、OM含量和p H值时空变化的主要驱动因素.
[Abstract]:Based on the long-term monitoring of soil chemical properties of the Wushan section and Zigui section of the three Gorges Reservoir after the fluctuation of the reservoir water level (2008) and once (2009) 4 times (2012) and 7 times (2015) after the fluctuation of the reservoir water level, the subsidence zone of the Zigui section and the Wushan section of the three Gorges Reservoir have experienced a long-term monitoring of the soil chemical properties after the fluctuation of the reservoir water level. The temporal and spatial dynamic changes of organic matter (OM) content and pH value of soil nitrogen, (N), phosphorus, (P), potassium and (K), were studied and their nutrient status was evaluated. The results showed that the contents of total nitrogen (TN), available nitrogen (AN), available potassium (AK), total phosphorus (TP), total potassium (TK), available phosphorus (AP) and pH increased with the increase of water level fluctuation times. After going through the fluctuation of reservoir water level and one fluctuation of reservoir water level, the contents of TP,TK and AP in each soil layer of the subsidence zone are the sample land of Zigui in Wushan sample land, and after 4 and 7 times of fluctuation of reservoir water level, it becomes the Wushan sample land of Zigui sample land. With the increase of the times of water level fluctuation in reservoirs, the difference of most soil chemical index contents between soil layers is decreased. Compared with the nutrient classification standard of the second national soil census, after seven reservoir water level fluctuations, the soil TP and AP content in Zigui sample land reached a very high grade, the soil AP content in Wushan sample land was high grade, and other indexes were medium and below grade. The hydrological characteristics of the three Gorges Reservoir, the disturbance of human activities and the difference of the chemical properties of different soils are the main driving factors for the spatial and temporal variation of the content of N _ (P _ (P) P _ (N) K _ (O) and the pH value of the soil in the declination zone of the canyon geomorphology.
【作者单位】： 中国林业科学研究院森林生态与环境保护研究所/国家林业局森林生态环境重点实验室;中国林业科学研究院华北林业实验中心;河北省塞罕坝机械林场;
【基金】：“十二五”国家科技支撑计划项目(2015BAD07B040301)资助~~
【分类号】：S153.6
本文编号：2239006
[Abstract]:Based on the long-term monitoring of soil chemical properties of the Wushan section and Zigui section of the three Gorges Reservoir after the fluctuation of the reservoir water level (2008) and once (2009) 4 times (2012) and 7 times (2015) after the fluctuation of the reservoir water level, the subsidence zone of the Zigui section and the Wushan section of the three Gorges Reservoir have experienced a long-term monitoring of the soil chemical properties after the fluctuation of the reservoir water level. The temporal and spatial dynamic changes of organic matter (OM) content and pH value of soil nitrogen, (N), phosphorus, (P), potassium and (K), were studied and their nutrient status was evaluated. The results showed that the contents of total nitrogen (TN), available nitrogen (AN), available potassium (AK), total phosphorus (TP), total potassium (TK), available phosphorus (AP) and pH increased with the increase of water level fluctuation times. After going through the fluctuation of reservoir water level and one fluctuation of reservoir water level, the contents of TP,TK and AP in each soil layer of the subsidence zone are the sample land of Zigui in Wushan sample land, and after 4 and 7 times of fluctuation of reservoir water level, it becomes the Wushan sample land of Zigui sample land. With the increase of the times of water level fluctuation in reservoirs, the difference of most soil chemical index contents between soil layers is decreased. Compared with the nutrient classification standard of the second national soil census, after seven reservoir water level fluctuations, the soil TP and AP content in Zigui sample land reached a very high grade, the soil AP content in Wushan sample land was high grade, and other indexes were medium and below grade. The hydrological characteristics of the three Gorges Reservoir, the disturbance of human activities and the difference of the chemical properties of different soils are the main driving factors for the spatial and temporal variation of the content of N _ (P _ (P) P _ (N) K _ (O) and the pH value of the soil in the declination zone of the canyon geomorphology.
【作者单位】： 中国林业科学研究院森林生态与环境保护研究所/国家林业局森林生态环境重点实验室;中国林业科学研究院华北林业实验中心;河北省塞罕坝机械林场;
【基金】：“十二五”国家科技支撑计划项目(2015BAD07B040301)资助~~
【分类号】：S153.6
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