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您的检索式：作者名="Juan PUIGDEFABREGAS"
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| 1 | Comparing Land Degradation and Regeneration Trends in China Drylands显示文摘The aim of this paper is to offer a statistically sound method to make a precise account of the speed of land degradation and regeneration processes.Most common analyses of land degradation focus instead on the extent of degraded areas,rather than on the intensity of degradation processes.The study was implemented for the Potential Extent of Desertification in China(PEDC),composed by arid,semi-arid,and dry sub-humid regions and refers to the period 2002 to 2012.The metrics were standard partial regression coefficients from stepwise regressions,fitted using Net Primary Productivity as the dependent variable,and year number and aridity as predictors.The results indicate that:①the extension of degrading lands(292896 km 2 or 9.12%of PEDC)overcomes the area that is recovering(194560 km 2 or 6.06%of PEDC);and②the intensity of degrading trends is lower than that of increasing trends in three land cover types(grassland,desert,and crops)and in two aridity levels(semi-arid and dry sub-humid).Such an outcome might pinpoint restoration policies by the Chinese government,and document a possible case of hysteresis. | Gabriel Del BARRIO Zhihai GAO Jaime Martinez-VALDERRAMA Xiaosong LI Maria ESANJUAN Bin SUN Alberto RUIZ Bengyu WANG Juan PUIGDEFABREGAS | 2020 | Journal of Geodesy and Geoinformation Science2020，3，4： | 2 |
| 2 | 荒漠化:压力超过恢复力探索一种统一的过程结构显示文摘1992年在里约热内卢召开的联合国环境与发展大会,将荒漠化定义为'由于包括气候变化和人类活动在内的诸多因素而引起的干旱、半干旱和干燥半湿润地区的土地退化'。联合国《防止荒漠化国际公约》把土地退化解释为土地的生物或经济生产力及复杂性的减少或丧失。然而,早在1977年因为萨赫勒(Sahel)大规模干旱而在内罗毕召开的联合国关于荒漠化的大会上。 | Juan Puigdefabregas 刘美敏 王欣 | 1995 | 人类环境杂志1995，24，5： | 0 |
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