[1] S RAMESH, K KAPLANA. Ecological integrity and environmental protection for vijayawada region-scattered eastern ghats. International Journal of Sustainable Built Environment, 109-116(2015).

[2] Baorong HUANG, Zhiyun OUYANG, Hua ZHENG et al. Connotation of ecological integrity and its assessment methods. Chinese Journal of Applied Ecology, 17, 2196-2202(2006).

[3] M JIANG, X PANG, J WANG et al. Islands ecological integrity evaluation using multi sources data. Ocean & Coastal Management, 158, 134-143(2018).

[4] J R KARR, D R DUDLEY. Ecological perspective on water quality goals. Environmental Management, 5, 55-68(1981).

[5] J K ANDREASEN, R V O'NEILL, R NOSS et al. Considerations for the development of a terrestrial index of ecological integrity. Ecological Indicators, 1, 21-35(2001).

[6] K E HECKMANN, P N MANLEY, M D SCHLESINGER. Ecological integrity of remnant montane forests along an urban gradient in the sierra nevada. Forest Ecology and Management, 255, 2453-2466(2008).

[7] F MORA. The use of ecological integrity indicators within the natural capital index framework： The ecological and economic value of the remnant natural capital of Mexico. Journal for Nature Conservation, 47, 77-92(2019).

[8] Z Z PAN, J H HE, D F LIU et al. Ecosystem health assessment based on ecological integrity and ecosystem services demand in the Middle Reaches of the Yangtze River Economic Belt，China. Science of The Total Environment, 144837(2021).

[9] J CASTELA, V FERREIAR, M A S GRACA. Evaluation of stream ecological integrity using litter decomposition and benthic invertebrates. Environ Pollut, 153, 440-449(2008).

[10] Xuejun DUAN, Hui ZOU, Xiaolong WANG et al. Implication and assessment of the ecological integrity of reverforont along great rivers： Taking the Yangtze River as an example. Acta Ecologica Sinica, 43, 5788-5801(2023).

[11] Y Q SHI, N L WANG et al. Evaluation of landscape ecological integrity in the yulin region，China. Sustainability［, 10, 1-13(2018).

[12] D M THEOBALD. A general model to quantify ecological integrity. Landscape Ecology, 1859-1874(2013).

[13] P MANOLAKI, S CHOURABI, I N VOGIATZAKIS. A rapid qualitative methodology for ecological integrity assessment across a Mediterranean island's landscapes. Ecological Complexity, 46, 1-10(2021).

[14] W CAI, Z ZHOU, J XIA et al. An advanced Index of Ecological Integrity （IEI） for assessing ecological efficiency of restauration revetments in river plain. Ecological Indicators, 108, 105762(2020).

[15] M I H REZA, A A SAIFUL. Regional Index of Ecological Integrity： A need for sustainable management of natural resources. Ecological Indicators, 220-229(2011).

[16] Xiaowu MA, Xibao XU, Jingyi LI. Changes of terrestrial ecosystem intetrity index and driving factors in the Yantze River Delta from 2000 to 2018. Acta Ecological Sinica, 42, 3738-3748(2022).

[17] J M WANG, R X YANG, Z K BAI. Spatial variability and sampling optimization of soil organic carbon and total nitrogen for Minesoils of the loess plateau using geostatistics. Ecological Engineering, 159-164(2015).

[18] P GOOCAERTS. Geostatistics in soil science： State-of-the-art and perspectives. Geoderma, s1, 1-45(1999).

[19] P GOOVAERTS. Geostatistical approaches for incorporating elevation into the spatial interpolation of rainfall. Journal of Hydrology, 228, 113-129(2000).

[20] P GOOVAERTS. Geostatistical tools for characterizing the spatial variability of microbiological and physico-chemical soil properties. Biology and Fertility of Soils, 27, 315-334(1998).

[21] R S YOST, G UEHARA, R L FOX. Geostatistical analysis of soil chemical properties of large land areas. I. Semi-variograms. Journal of the Soil Science Society of America, 46, 1028-1032(1982).

[22] L A CAMAIGO, J J MARQUES, G T PEREIRA et al. Spatial correlation between the composition of the clay fraction and contents of available phosphorus of an Oxisol at hillslope scale. Catena, 100-106(2013).

[23] Z ZOLFAGHARI, S AYOUBI, M R MOSADDEGHI. Spatial variability of some soil shrinkage indices in hilly calcareous region of western Iran. Soil and Tillage Research, 180-191(2015).

[24] J J GOMEZ-HERNANDEZ, A HORTA, N JEANEE. Geostatistics for environmental applications. Spatial Statistics, 1-2(2013).

[25] R S YOST, G UEHARA, R L FOX. Geostatistical analysis of soil chemical properties of large land areas.Ⅱ. Kriging 1. Soil Science Society of America Journal, 46, 1033-1037(1982).

[26] R WEBSTER, M A OLIVER. Optimal interpolation and isarithmic mapping of soil properties. Vi. Disjunctive kriging and mapping the conditional porbability. Journal of Soil Science, 40, 497-512(1989).

[27] R WEBSTER, M A OLIVER. Geostatistics for environmental scientists(2007).

[28] T SYAM. Spatial variability of soil nutrients content related to rice yield. Jurnal Tanah Tropika, 15, 153-157(2010).

[29] F STEVENS, P BOGAERT, B WESEMAEL. Detecting and quantifying field-related spatial variation of soil organic carbon using mixed-effect models and airborne imagery. Geoderma, 259-260, 93-103(2015).

[30] J YANG, H S CHEN, Y P NIE et al. Spatial variability of shallow soil moisture and its stable isotope values on a karst hillslope. Geoderma, 61-70(2016).

[31] T T Wu, Y R Li. Spatial interpolation of temperature in the united states using residual kriging. Applied Geography, 44, 112-120(2013).

[32] A SARANG, C MADRAMOOTOO. Geostatistical methods for prediction of spatial variability of rainfall in a mountainous region. Transactions of the American Society of Agricultural Engineers, 48, 943-954(2005).

[33] Y J YANG, J H ZHU, C J ZHAO et al. The spatial continuity study of NDVI based on kriging and BPNN algorithm. Mathe-matical and Computer Modelling, 54, 1138-1144(2011).

[34] F UNGARO, I ZASADA, A PIORR. Mapping landscape services， spatial synergies and trade-offs. A case study using variogram models and geostatistical simulations in an agrarian landscape in North-east Germany. Ecological Indicators, 367-378(2014).

[35] M H NAZARIFAR, R MOMENI, M H KANANI. Comparison of spatial interpolation methods for wheat water requirement and its temporal distribution in Hamedan province（Iran）. Journal of Urban and Environmental Engineering, 8, 218-224(2014).

[36] A E MOHAMED, R ABDEL, A NATARAJAN. Assessment of land degradation using comprehensive geostatistical approach and remote sensing data in GIS-model builder. The Egyptian Journal of Remote Sensing and Space Science, 22, 323-334(2019).

[37] Yuqiong SHI, Tuansheng LI. Analysis of spatial variation of arable land quality in Wugong County. Chinese Journal of Soil Science, 48, 257-262(2017).

[38] P MANOLAKI, S CHOURABI, I VOGIATZAKIS. N. A rapid qualitative methodology for ecological integrity assessment across a Mediterranean island’s landscapes. Ecological Complexity, 46, 100921(2021).

[39] W ZHAO, T YAN, X DING et al. Response of ecological quality to the evolution of land use structure in Taiyuan during 2003 to 2018. Alexandria Engineering Journal, 60, 1777-1785(2021).

[40] Zuying LIU, Bing WANG, Yusen ZHAO et al. Monitoring and evaluation of the effects of Grain for Green Project in the upper and middle reaches of China’s Yangtze River. Chinese Journal of Applied Ecology, 29, 2463-2469(2018).

[41] Yue LIANG, Juying JIAO. Characteristics of sediment retention by check-dams before and after the "Grain for Green"project in the He·Long Reach of the Yellow River. Acta Ecological Sinica, 39, 4579-4586(2019).

[42] T WANG. Impacts of the grain for green project on soil erosion： A case study in the Wuding river and Luohe river basins in the Shaanxi province of China. Applied Ecology and Environmental Research, 16, 4165-418(2018).

[43] D LIU, Y CHEN, W W CAI et al. The contribution of China's Grain to Green Program to carbon sequestration. Landscape Ecology, 29, 1675-1688(2014).

[44] F Q SONG, M Y KANG, Z L ZHENG et al. Variations of NPP and Carbon stock benefits before and after the Grain for Green Project in Northern Shaanxi. Applied Mechanics and Materials, 195-196, 1237-1242(2012).

[45] Rui ZHANG, Jingjuan CAO, Ruiying GUO et al. Effect of converting cultivated land to forest-grassland on soil carbon， nitrogen and phosphoras in sub-alpine grassland region of north slope of Qilian Mountains. Ecology and Environmental Sciences, 23, 938-944(2014).

[46] Shengtao LIU, Xiang NIU, Bing WANG et al. An ecological benefit assessment of the Grain for Green Project in Shaanxi Province. Acta Ecologica Sinica, 38, 5759-5770(2018).

[47] H ZHOU, F XU, J W DONG et al. Tracking reforestation in the Loess Plateau，China after the“Grain for Green”Project through integrating PALSAR and Landsat imagery. International Journal of Remote Sensing, 11, 2685-2707(2019).

[48] Decheng ZHOU, Shuqing ZHAO, Chao ZHU. The impact of the Grain for Green Project on the land use/cover change in the Northern Farming-pastoral Ecotone，China—A case study of Kezuohouqi County. Scientia Geographica Sinica, 32, 442-449(2012).