[1] Reynolds J F, Smith D M S, Lambin E F. Global desertification:building a science for dryland development[J]. Science, 2007, 316(5826): 847-851.
2] Cao S, Tian T, Chen L, et al. Damage caused to the environmentby reforestation policies in arid and semi-arid areas of China[J].Ambio, 2010, 39(4): 279-283.
3] Wang T, Zhu Z D, Wu W. Sandy desertification in the north of Chi⁃na[J]. Science in China Series D, 2002, 45(1): 23-34.
4] 陈晓光, 李剑萍, 韩颖娟, 等. 宁夏近20年来植被覆盖度及其与气温降水的关系[J]. 生态学杂志, 2007, 26(9): 1375-1383.[Chen Xiaoguang, Li Jianping, Han Yingjuan, et al. Vegetationcoverage and its relationships with temperature and precipitationin Ningxia in 1981-2004[J]. Chinese Journal of Ecology, 2007, 26(9): 1375-1383. ]
[5] 王占军, 蒋齐, 刘华, 等. 宁夏干旱风沙区林药间作生态恢复措施与土壤环境效应响应的研究[J]. 水土保持学报, 2007, 21(4):90-93. [Wang Zhanjun, Jiang Qi, Liu Hua, et al. Research on re⁃spond of ecological restoration measure of forest medicine inter⁃cropping and environmental effect of soil in arid wind-desert re⁃gion of Ningxia[J]. Journal of Soil and Water Conservation, 2007,21(4): 90-93. ]
[6] Li Qingxue, Jia Zhiqing, Liu Tao, et al. Effects of different planta⁃tion types on soil properties after vegetation restoration in an al⁃pine sandy land on the Tibetan Plateau, China[J]. Journal of AridLand, 2017, 9(2): 200-209.
7] Zhang J Y, Gu P F, Li L Y, et al. Changes of soil particle size frac⁃tion along a chrono sequence in sandy desertified land: A funda⁃mental process for ecosystem succession and ecological restoration[J]. Journal of Soils & Sediments, 2016, 16(12): 2651-2656.
8] 李尝君, 曾凡江, 郭京衡, 等. 植被恢复程度与沙地土壤性质——以塔克拉玛干沙漠南缘为例[J]. 干旱区研究, 2015, 32(6):1061- 1067. [Li Changjun, Zeng Fanjiang, Guo Jingheng, et al.Soil properties of different sandy lands under different vegetationrecovering levels: A case in southern Taklimakan Desert[J]. AridZone Research, 2015, 32(6): 1061-1067. ]
[9] 贾晓红, 李新荣, 李元寿. 干旱沙区植被恢复过程中土壤颗粒分形特征[J]. 地理研究, 2007, 26(3): 518-525. [Jia Xiaohong, LiXinrong, Li Yuanshou. Fractal dimension of soil particle size dis⁃tribution during the process of vegetation restoration in arid sanddune area[J]. Geographical Research, 2007, 26(3): 518-525. ]
[10] 李裕元, 邵明安, 陈洪松, 等. 水蚀风蚀交错带植被恢复对土壤物理性质的影响[J]. 生态学报, 2010, 30(16): 4306-4316. [LiYuyuan, Shao Ming’an, Chen Hongsong, et al. Impacts of vegeta⁃tion recovery on soil physical properties in the cross area of windwatererosion[J]. Acta Ecologica Sinica, 2010, 30(16): 4306-4316. ]
[11] 齐雁冰, 常庆瑞, 惠泱河. 人工植被恢复荒漠化逆转过程中土壤颗粒分形特征[J]. 土壤学报, 2007, 44(3): 566-570. [Qi Yanbing,Chang Qingrui, Hui Yanghe. Fractal fratures of soil particles in de⁃sertification reversing process by artificial vegetation[J]. Acta Pe⁃dologica Sinica, 2007, 44(3): 566-570. ]
[12] 王月玲, 蔡进军, 张源润, 等. 半干旱退化山区不同生态恢复与重建措施下土壤理化性质的特征分析[J]. 水土保持研究, 2007, 14(1): 11-14. [Wang Yueling, Cai Jinjun, Zhang Yuanrun, et al.Soil physical and chemical properties during different ecologicalrestoration or reconstruction in semi-arid degraded mountain area[J]. Research of Soil and Water Conservation, 2007, 14(1): 11-14. ]
[13] Chen Xiaohong, Duan Zhenghu. Changes in soil physical andchemical properties during reversal of desertification in YanchiCounty of Ningxia Hui autonomous region, China[J]. Environmen⁃tal Geology, 2009, 57(5): 975-985.
[14] 成毅, 安韶山, 李国辉, 等. 宁夏黄土丘陵区植被恢复对土壤养分和微生物生物量的影响[J]. 中国生态农业学报, 2010, 18(2):261-266. [Cheng Yi, An Shaoshan, Li Guohui, et al. Soil nutrientand microbial biomass in the Loess Hilly area of Ningxia under dif⁃ferent plant rehabilitation patterns[J]. Chinese Journal of Eco-Ag⁃riculture, 2010, 18(2): 261-266. ]
[15] 黄昌勇. 土壤学[M]. 北京: 中国农业出版社, 2000. [HuangChangyong. Soil Science[M]. Beijing: China Agriculture Press, 2000. ]
[16] 刘耘华, 盛建东, 武红旗, 等. 干旱区三种荒漠植被“肥岛”土壤颗粒变异特征研究[J]. 土壤, 2011, 43(6): 975-980. [Liu Yun⁃hua, Sheng Jiandong, Wu Hongqi, et al. Study on variation fea⁃tures of soil particles in‘Fertile Islands’of three desert vegeta⁃tions in arid region[J]. Soils, 2011, 43(6): 975-980. ]
[17] 王梅梅, 朱志玲, 吴咏梅. 宁夏中部干旱带土地沙漠化评价[J].中国沙漠, 2013, 33(2): 320-324. [Wang Meimei, Zhu Zhiling,Wu Yongmei. Assessment on the sensitivity to aeolian desertifica⁃tion and importance of controlling aeolian desertification in themiddle arid region of Ningxia[J]. Journal of Desert Research,2013, 33(2): 320-324. ]
[18] 程淑杰, 朱志玲, 白林波. 基于GIS的人居环境生态适宜性评价——以宁夏中部干旱带为例[J]. 干旱区研究, 2015, 32(1): 176-183. [Cheng Shujie, Zhu Zhiling, Bai Linbo. GIS-based assess⁃ment on ecological suitability for human settlement: A case studyin the central arid zone in Ningxia[J]. Arid Zone Research, 2015,32(1): 176-183. ]
[19] 王新平, 李新荣, 肖洪浪, 等. 干旱半干旱地区人工固沙灌木林生态系统演变特征[J]. 生态学报, 2005, 25(8): 1974-1980.[Wang Xinping, Li Xinrong, Xiao Honglang, et al. Evolution char⁃acteristics of the artificially re-vegetated shrub ecosystem of aridand semi-arid sand dune area[J]. Acta Ecologica Sinica, 2005, 25(8): 1974-1980. ]
[20] 杜海燕, 周智彬, 刘凤山, 等. 绿洲化过程中阿拉尔垦区土壤粒径分形变化特征[J]. 干旱区研究, 2013, 30(4): 615-622. [DuHaiyan, Zhou Zhibin, Liu Fengshan, et al. Variation of fractal di⁃mension of soil particle size distribution in the Aral reclamation ar⁃ea in oasis development[J]. Arid Zone Research, 2013, 30(4): 615-622. ]
[21] Wezel A, Rajot J L, Herbrig C. Influence of shrubs on soil charac⁃teristics and their function in Sahelian agro-ecosystems in semiaridNiger[J]. Journal of Arid Environments, 2000, 44(4): 383-398.
[22] Parsons A J, Abrahams A D, Simanton J R. Microtopography andsoil-surface materials on semi-arid piedmont hillslopes, southernArizona[J]. Journal of Arid Environments, 1992, 22(2): 107-115.
23] Cao S, Wang G, Chen L. Questionable value of planting thirstytrees in dry regions[J]. Nature, 2010, 465(7294): 31-31.
[24] 张继义, 赵哈林. 退化沙质草地恢复过程土壤颗粒组成变化对土壤-植被系统稳定性的影响[J]. 生态环境学报, 2009, 18(4):1395-1401. [Zhang Jiyi, Zhao Halin. Changes in soil particles frac⁃tion and their effects on stability of soil-vegetation system in resto⁃ration processes of degraded sandy grassland[J]. Ecology and Envi⁃ronmental Sciences, 2009, 18(4): 1395-1401. ]
[25] Rathore V S, Singh J P, Bhardwaj S. Potential of native shrubs Hal⁃oxylon salicornicum and Calligonum polygonoides for restorationof degraded lands in arid western Rajasthan, India[J]. Environmen⁃tal Management, 2015, 55(1): 205-216.
[26] Parizek B, Rostagno C M, Sottini R. Soil erosion as affected byshrub encroachment in northeastern Patagonia[J]. Journal of RangeManagement, 2002, 55(1): 43-48.
[27] Li H, Shen H, Chen L, et al. Effects of shrub encroachment on soilorganic carbon in global grasslands[J]. Scientific Reports, 2016, 6(1): 28974.
[28] Chen L, Li H, Zhang P. Climate and native grassland vegetation asdrivers of the community structures of shrub-encroached grass⁃lands in Inner Mongolia, China[J]. Landscape Ecology, 2015, 30(9): 1627-1641.
[29] 李宗超, 胡霞. 小叶锦鸡儿灌丛化对退化沙质草地土壤孔隙特征的影响[J]. 土壤学报, 2015, 52(1): 242-248. [Li Zongchao, HuXia. Effects of shrub (Caragana microphylla Lam) encroachmenton soil porosity of degraded sandy grassland[J]. Acta PedologicaSinica, 2015, 52(1): 242-248.
[30] Belay T A, Totland, Moe S R. Ecosystem responses to woody plantencroachment in a semiarid savanna rangeland[J]. Plant Ecology,2013, 214(10): 1211-1222.
[31] Zhou L H, Shen H H, Chen L Y, et al. Ecological consequences ofshrub encroachment in the grasslands of northern China[J]. Land⁃scape Ecology, 2019, 34(1): 119-130.
[32] Knapp A K, Briggs J M, Collins S L, et al. Shrub encroachment innorth American grasslands: shifts in growth form dominance rapid⁃ly alters control of ecosystem carbon inputs[J]. Global Change Biol⁃ogy, 2008, 14(3): 615-623.