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| 半干旱黄土丘陵区不同坡位退耕还林还草地土壤养分的变异规律 | |
| 引用本文： | 徐志友,余峰,高红军,蔡进军.半干旱黄土丘陵区不同坡位退耕还林还草地土壤养分的变异规律[J].中国水土保持,2010(8):39-41. |
| 作者姓名： | 徐志友 余峰 高红军 蔡进军 |
| 作者单位： | 1. 宁夏水利厅,水土保持局,宁夏,银川,750001 2. 宁夏回族自治区防沙治沙与退耕还林工作站,宁夏,银川,750001 3. 宁夏农林科学院,宁夏,银川,750002 |
| 基金项目： | "十一五"国家科技支撑计划课题，宁夏自然科学基金 |
| 摘 要： | 在宁南山区黄土丘陵区开展了退耕还林还草工程效益监测研究,测定了不同坡位退耕还林还草地的土壤养分。对土壤养分单因子分析结果表明:在同一坡面上,随着坡位的降低,退耕还林还草地0—100 cm土层土壤有机质、全氮、全磷、速效氮、速效磷平均含量增加;从不同坡位退耕还林还草地各层土壤养分含量来看,随着土层深度的增加,土壤有机质、全氮、全磷、速效氮、速效磷、速效钾含量在降低。说明半干旱黄土丘陵区林带间种植的苜蓿经营粗放,加剧了土壤养分的失调。 |
| 关 键 词： | 坡位 土壤养分 退耕还林还草地 半干旱地区 黄土丘陵区 |
Variation Laws of Soil Nutrients of Returning Cultivated Land to Woodland or Grassland at Different Slope Positions of Semi-Arid Gullied Rolling Loess Area |
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| Abstract: | The paper monitors and studies the benefits of returning cultivated land to woodland or grassland project and tests the soil nutrients of those returned lands at different slope positions of loess hilly region in southern Ningxia.The outcomes of single-factor analysis of soil nutrients show that a) at the same slope,the average contents of organic matter,total N,total P,available N and available P increase along with the decrease of slope position except available K,When soil depth is 0 to 100 cm;b) viewing from the contents of soil nutrient at each layer of different slope position of those returned lands,the organic matter,total N,total P,available N,available P and available K decrease along with the increase of soil depth.It shows that the extensive management of Medicago sativa planted in forest belts of semi-arid gullied rolling loess area has intensified the imbalance of soil nutrients. |
| Keywords: | slope position soil nutrient returning cultivated land to woodland or grassland semi-arid gullied rolling loess area |
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