Every reference with a DOI in the deposited reference list resolved to a known
work in Crossref or DataCite at the dated check, and none carried a retraction,
withdrawal, or removal notice.
The 21 references without a DOI — listed, not checked
no DOI — not checkedChen Yongzong, Jing Ke, Cai Qiangguo. Modern Erosion and Management. Beijing: Science Press, 1988.
no DOI — not checkedLal R. Soil erosion by wind and water: problems and proposals. In: R Lal Soil Erosion Research Methods. The Soil Erosion and Water Conservation Society. 1988.
no DOI — not checkedShi Nianhai. Loess Plateau and evolution of its agro-forest distribution area.Historical Geography, First Issue, 1981, 15–35.
no DOI — not checkedZhu Kezhen. Preliminary study of climate change in the last 5000 years of China.Science in China. 1973, (2).
no DOI — not checkedTang Keli, Cai Qing. Relationship between soil erosional process and eco-environmental evolution on the Loess Plateau. Collected Papers on Environmental Evolution and Law on Water and Silt Operation in Huanghe Drainage Basin. Beijing: Geologic Press, 1991.
no DOI — not checkedLiang Jianminet al. Observation and experiment of rainfall interception of tree canopies. Collected Papers of Geography, 1980, 12.
no DOI — not checkedHudson N. W. Soil Conservation. London, Bafsford. 1971.
no DOI — not checkedCai Qiang-guo, Chen Hao. Impact of vegetation coverage on rainfall splashing. In: Proceedings of Origin and Erosion Induced Sand Mechanisms of the Coarse Sandy-Silt in Huanghe. Beijing: Meteorological Press, 1989.
no DOI — not checkedCheng Jimin. The role of forest vegetation on Ziwuling to soil erosion.Soil and Water Conservation in China, 1987, 5.
no DOI — not checkedXia Xuan, Tang Keliet al. Study on impact of vegetation on soil properties and soil erosion.Soil and Water Conservation, 1992, 6(2).
no DOI — not checkedLi Yonget al. Root system of plant and wash resistence of soil.Soil and Water Conservation, 1993, 17(3).
no DOI — not checkedZeng Boqing, Ma Wenzhonget al. Study on impact of artificial grass coverage on water-borne silt yield. Collected Papers on Sino-Canada Study of Soil Erosion Regularity on Loess Plateau of West Shanxi, China. Beijing: Water and Hydropower Publishing House, 1990.
no DOI — not checkedCai Qiangguo, Wu Shuan, Chen Hao, Ma Shaojia. Impact of steep slope grass planting on runoff erosion induced silt yield. In: Study on Surface Material Migrational Law in Huanghe Drainage Basin and Geomorphologic Formation Process. Beijing: Geological Press, 1992, 80–89.
no DOI — not checkedShi Nianhai, Cao Erqin, Zhu Shiguang. Evolution of Forest and Grass on the Loess Plateau. Xi’an: Shaanxi People’s Publishing House, 1985.
no DOI — not checkedWang Shouchun. On Loess Plateau vegetation in ancient times.Geographical Research, 1990,19 (4).
no DOI — not checkedCai Qiangguo, Wang Gui-ping, Chen Yong-zong. Small Drainage Basin Erosion Process and Simulation on the Loess Plateau. Beijing: Science Press, 1998.
no DOI — not checkedLuk S H, H Chao, Cai Q G, Z J Jia. Spatial and temporal variation in the strength of loess soil, Lishi, China.Geoderma, 1989,4, 307–317.
no DOI — not checkedZheng Fenli, Tang Keli, Zhou Peihua. Study on influencial factors rill erosion of the slopeland,Acta Pedologica Sinica, 1989, 26(2).
no DOI — not checkedLi Wenhuaet al. (ed.). Agroforestry Management in China. Beijing: Science Press, 1994.
no DOI — not checkedTanh Keli. Discussion on critical propblems concerning eco-environmental rehabilitation on the Loess Plateau.Bulletin of Soil and Water Conservation, 1989, 18: 1–7.
no DOI — not checkedCai Qiangguo, Lak S H, Wang Guiping. Impact of human activities on erosion induced silt yield in small watershed on the Loess Plateau. In: Soil Erosion Management and Applied Research on GIS. Beijing: Science Press, 1992. 198–212.
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