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Effects of nutrient manipulation (NUMEX) on the performance of tropical montane trees and interactions with climate variation and ENSO-related weather extremes

营养控制 (NUMEX) 对热带山地树木性能的影响以及与气候变化和 ENSO 相关极端天气的相互作用

基本信息

批准号：
227670910
负责人：
Dr. Jürgen Homeier
金额：
--
依托单位：
Fakultät Ressourcenmanagement
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/227670910?language=en
关键词：
Effects nutrient manipulation NUMEX performance

项目摘要

Tropical mountain ecosystems and their vegetation are considered to be especially sensitive to global environmental change. Due to the complexity of these ecosystems and the interaction of different drivers (land use change, climate change, and increasing nutrient deposition), understanding current responses and predicting future changes in mountain ecosystems is difficult but urgently needed. The effects of higher rates of atmospheric N and P deposition on the biological diversity and ecosystem functioning of tropical ecosystems are still poorly understood and our knowledge of N and P limitation in tropical forest ecosystems is still limited, but it will be of critical importance to know the effects of increased nutrient availability to conserve these ecosystems. The effects of continued nutrient addition are investigated along an elevational transect of Andean forests in southern Ecuador within the ongoing Ecuadorian NUtrient Manipulation EXperiment (NUMEX). NUMEX started in January 2008 adding moderate amounts of N (50 kg ha-1 yr-1), P (10 kg ha-1 yr-1), and N and P to representative stands at 1000, 2000 and 3000 m. The project of 12 months duration will synthesize 9 years of data retrieved on the NUMEX plots and includes the collection of a final data set on aboveground productivity and tree recruitment. In addition, the current El Niño event (2015-2016) and the expected La Niña event (2016-2017) offer the unique opportunity to study the effects of extreme weather events on nutrient-manipulated forest plots. With the proposed project, the influences of climate variation and weather seasonality on tree growth and the potential interactions or feedbacks between climate and increasing N and P availability will be analysed. For a better understanding of the ecosystem response to a changing environment and the contribution of tree species composition to this response, it is essential to disentangle the effects of climate-related drivers and nutrient availability. The results will allow predicting future changes in tree species composition and forest structure as a consequence of increasing nutrient deposition and should be incorporated in monitoring schemes for Andean forests and the ecosystem services provided by these forests. The project will continue to be responsible for the coordination and maintenance of NUMEX. Further objectives of the prolongation phase are to summarize above- and belowground vegetation effects on stand and species level for the 9 years of NUMEX and to lead the final joint synthesis of the aggregated data of the participating projects.

热带山地生态系统及其植被被认为对全球环境变化特别敏感。由于这些生态系统的复杂性和不同驱动因素（土地利用变化、气候变化和不断增加的养分沉积）的相互作用，了解山地生态系统当前的响应和预测未来的变化是困难的，但迫切需要。大气氮磷沉降对热带生态系统生物多样性和生态系统功能的影响尚不清楚，我们对热带森林生态系统氮磷限制的认识仍然有限，但了解增加养分可得性对保护这些生态系统的影响至关重要。在正在进行的厄瓜多尔营养操纵实验（NUMEX）中，沿着厄瓜多尔南部安第斯森林的海拔样带调查了持续营养添加的影响。NUMEX于2008年1月开始在1000、2000和3000 m的代表性林分上适量添加N （50 kg ha-1年-1）、P （10 kg ha-1年-1）和N和P。为期12个月的项目将综合从NUMEX地块检索的9年数据，包括收集地上生产力和树木采伐的最终数据集。此外，目前的El Niño事件（2015-2016年）和预期的La Niña事件（2016-2017年）为研究极端天气事件对营养操纵森林地块的影响提供了独特的机会。该项目将分析气候变化和天气季节性对树木生长的影响，以及气候与氮磷有效性增加之间潜在的相互作用或反馈。为了更好地了解生态系统对环境变化的响应以及树种组成对这种响应的贡献，有必要理清气候相关驱动因素和养分有效性的影响。这些结果将有助于预测由于养分沉积增加而导致的树种组成和森林结构的未来变化，并应纳入安第斯森林和这些森林提供的生态系统服务的监测计划。该项目将继续负责协调和维持NUMEX。延长阶段的进一步目标是总结NUMEX 9年期间地上和地下植被对林分和物种水平的影响，并领导参与项目汇总数据的最后联合综合。