Soil physicochemical properties of alpine grasslands under different desertification degrees in Maqu， Gansu， China
Received date: 2022-04-06
Revised date: 2022-04-21
Online published: 2023-01-09
Desertification is one of the important indicators of alpine grassland degradation in the eastern margin of the Qinghai-Tibet Plateau， and soil physical and chemical properties are important characteristic parameters reflecting grassland desertification process. Taking Maqu County in the eastern margin of the Qinghai-Tibet Plateau as an example， the differences of soil grain size， temperature and humidity， organic carbon and nutrients in natural， light desertification， moderate desertification， severe desertification， and very severe desertification grasslands were compared and analyzed in order to clarify the change process of soil physical and chemical properties during the desertification process of alpine grassland. The results showed that the contents of clay and silt decreased significantly with the development of desertification， while the contents of sand increased with the increase of desertification. During the growing season from May to August， the temperature of severe desertification soil was significantly higher than that of light desertification soil， and the soil water content was significantly lower. With the increase of desertification degree， the soil organic carbon content decreased significantly， the light desertification decreased by more than 50%， and moderate to very severe desertification decreased by 91%-99%. The contents of soil total nitrogen （TN）， alkali-hydrolyzable nitrogen （AN）， total phosphorus （TP） and available phosphorus （AP） decreased significantly in light and over light desertification grasslands， while total potassium （TK） did not change significantly， and available potassium （AK） decreased only in moderate to very severe desertification grassland. The results indicate that in the process of alpine grassland desertification， with the continuous decrease of vegetation coverage， the surface fine particles are gradually eroded by wind， resulting in the loss of soil nutrient， while coarse particles retain， and soil water content decreases； under the action of wind sorting， continuous accumulation of sand particles forms mobile dunes. The results can provide theoretical basis for alpine desertification grassland management and grassland ecosystem restoration.
Key words： alpine grassland; desertification; soil physicochemical properties; Maqu
Shilong Li . Soil physicochemical properties of alpine grasslands under different desertification degrees in Maqu， Gansu， China[J]. Journal of Desert Research, 2022 , 42(6) : 44 -52 . DOI: 10.7522/j.issn.1000-694X.2022.00040
| 1 | 王庆辉，窦学诚，龚大鑫.高寒牧区草地沙化问题研究：以玛曲草原为例［J］.干旱区地理，2012，35（2）：302-308. |
| 2 | 陈秋捷，张楠楠，仲波，等.若尔盖高寒草地退化沙化过程中土壤养分与团聚体结构的变化特征［J］.生态科学，2019，38（4）：13-20. |
| 3 | 张有佳，李昌龙，金红喜，等.甘肃玛曲高寒草原沙化草地植物多样性研究［J］.安徽农业科学，2013，41（18）：7929-7932. |
| 4 | 王辉，任继周，袁宏波.黄河源区天然草地沙化机理分析研究［J］.草业学报，2006（6）：19-25. |
| 5 | Dong Z B， Hu G Y， Yan C Z，et al.Aeolian desertification and its causes in the Zoige Plateau of China's Qinghai-Tibetan Plateau［J］.Environmental Earth Sciences，2010，59（8）：1731-1740. |
| 6 | 逯军峰，董治宝，胡光印，等.甘肃省玛曲县土地沙漠化发展及其成因分析［J］.中国沙漠，2012，32（3）：604-609. |
| 7 | Hu G Y， Jin H J， Dong Z B，et al.Driving forces of aeolian desertification in the source region of the Yellow River：1975-2005［J］.Environmental Earth Sciences，2013，70（7）：3245-3254. |
| 8 | Hu G Y， Dong Z B， Lu J F，et al.The developmental trend and influencing factors of aeolian desertification in the Zoige Basin，eastern Qinghai-Tibet Plateau［J］.Aeolian Research，2015，19：275-281. |
| 9 | 张余，张克存，孟宪红，等.高寒草地沙化过程的气候因子分析［J］.高原气象，2019，38（1）：187-195. |
| 10 | 安志山，史博源，谭立海，等.玛曲高寒草甸风沙环境与沙化类型研究［J］.干旱区研究，2021，38（4）：1058-1064. |
| 11 | 胡光印，董治宝，逯军峰，等.黄河源区1975-2005年沙漠化时空演变及其成因分析［J］.中国沙漠，2011，31（5）：1079-1086. |
| 12 | Le Houérou， Henry N.Climate change，drought and desertification［J］.Journal of Arid Environments，1996，34（2）：133-185. |
| 13 | Lu J， Dong Z， Li W，et al.The effect of desertification on carbon and nitrogen status in the northeastern margin of the Qinghai-Tibetan Plateau［J］.Environmental Earth Sciences，2014，71（2）：807-815. |
| 14 | 安富博，李银科，纪永福，等.黄河首曲高寒草甸的土壤特征及其对沙化的响应［J］.中国水土保持，2014（12）：48-51. |
| 15 | Wang X M， Lang L L， Hua T，et al.Effects of aeolian processes on soil nutrient loss in the Gonghe Basin，Qinghai-Tibet Plateau：an experimental study［J］.Journal of Soils and Sediments，2018，18（1）：229-238. |
| 16 | 万婷，涂卫国，席欢，等.川西北不同程度沙化草地植被和土壤特征研究［J］.草地学报，2013，21（4）：650-657. |
| 17 | Zuo X， Zhao X， Zhao H，et al.Spatial heterogeneity of soil properties and vegetation-soil relationships following vegetation restoration of mobile dunes in Horqin Sandy Land，Northern China［J］.Plant and Soil，2009，318（1）：153-167. |
| 18 | Allington G R H， Valone T J.Reversal of desertification：the role of physical and chemical soil properties［J］.Journal of Arid Environments，2010，74（8）：973-977. |
| 19 | 蔡晓布，彭岳林，魏素珍，等.高寒草原土壤有机碳与腐殖质碳变化及其微生物效应［J］.土壤学报，2014，51（4）：834-844. |
| 20 | 邹丽娜，周志宇，颜淑云，等.玛曲高寒草地土壤养分对不同利用方式的响应［J］.中国草地学报，2009，31（6）：80-87. |
| 21 | Jin Z， Dong Y S， Qi Y C，et al.Characterizing variations in soil particle-size distribution along a grass-desert shrub transition in the ordos plateau of Inner Mongolia，China［J］.Land Degradation & Development，2013，24（2）：141-146. |
| 22 | Su Y Z， Zhao H L， Zhao W Z，et al.Fractal features of soil particle size distribution and the implication for indicating desertification［J］.Geoderma，2004，122（1）：43-49. |
| 23 | Liu X， Zhang G C， Heathman G C，et al.Fractal features of soil particle-size distribution as affected by plant communities in the forested region of Mountain Yimeng，China［J］.Geoderma，2009，154（1/2）：123-130. |
| 24 | 王涛.中国沙漠与沙漠化［M］.石家庄：河北科学技术出版社，2003. |
| 25 | 胡光印，董治宝，王文丽，等.近30 a玛曲县土地利用/覆盖变化监测［J］.中国沙漠，2009，29（3）：457-462. |
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