External factors of eco-technological water management - influences of land use and climate change

蒸散发（ET）和降水是地表水更新的控制因子。在ET、C、N预算和土地利用之间存在各种反馈，必须考虑到这些反馈，以便在气候变化的动态条件下进行生态技术水管理。P8的目标是调查RU目标地区的气候和土地利用变化，并探索土地利用作为生态技术的潜在工具。将特别强调过去极端水文事件的频率、持续时间和强度（例如2002年的洪水和2003年的干旱）的影响，以及土地利用对ET、C和N通量的干旱敏感性差异。研究将基于一个现有的广泛的近期气候数据库，以及由全球气候变化的区域降尺度得到的关于未来气候的类似信息。具有长期通量测量的试验点涵盖了主要的土地利用，如云杉和山毛榉林、草地和作物轮作，以及具有近40年连续数据的集水区。应用的模型将包括像HIRVAC这样的ABL模型、像PnET这样的SVAT方案和像BROOK90这样的水预算模型。1992年和2002年两次基于遥感的调查之间的土地利用变化将对所制定的方法进行检验。

Evapotranspiration (ET) and precipitation are the governing factors for the renewal of surface waters. There exist various feed backs between ET, C, N budgets and land use that have to be taken into consideration to allow an eco-technological water management under the dynamic conditions of climate change. The objective of P8 is to investigate climate and landuse change in the target areas of the RU, and to explore land use as a potential tool of ecotechnology. Special emphasis will be put on influences of the frequency, duration and intensity of hydrological extremes in the past (e.g., flood of 2002 and drought of 2003) and differences in drought sensitivity of land uses with respect of ET, C and N fluxes. Research will be based on an existing extensive data bank of recent climate, as well as similar information on future climate derived by regional downscaling of global climate change. Experimental sites with long-term flux measurements cover major land uses like spruce and beech forests, grassland, and crop rotation as well as a catchment with almost 40 years of continuous data. Models applied will include ABL models like HIRVAC, SVAT schemes like PnET, and water budget models like BROOK90. Land use change between two remote sensing based surveys of 1992 and 2002 will serve as a test for the methods developed.