Evaluating the effect of shade trees on provision of ecosystem services in intensively managed coffee plantations
Evaluating the effect of shade trees on provision of ecosystem services in intensively managed coffee plantations
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DOI：
10.1016/j.agee.2017.05.005
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发表时间：
2017-07-01
影响因子：
6.6
通讯作者：
Rapidel, Bruno
中科院分区：
文献类型：
--
作者：
Meylan, Louise;Gary, Christian;Rapidel, Bruno
强调主要作物生产力的集约管理种植系统可以受益于系统中树木整合带来的额外生态系统服务，但也必须考虑潜在的缺点。在一项农场研究中，我们使用了各种植物、土壤和水相关变量来评估刺桐属植物的影响。和芭蕉属（Musa spp.）关于在哥斯达黎加生产性、高质量的阿拉比卡咖啡种植园提供生态系统服务。我们发现：1）遮荫树对咖啡产量总体上没有显著影响; 2）有证据表明遮荫树确实影响开花和随后的樱桃发育，其影响强烈依赖于气候和咖啡植物生理学的年度变化; 3）刺桐遮荫树显著增加土壤凋落物和土壤中水分的相对渗透率，两者都与土壤保持和减少侵蚀有关; 4）即使在高施肥环境中，刺桐树也会固定相邻咖啡树所吸收的N。遮荫树对咖啡总产量没有显著的负面影响，而且观察到提供了其他有用的服务，这并不意外，因为1）研究地点的遮荫树密度低（100-350棵树/公顷，平均每年修剪两次）和2）咖啡产量对其他相互作用的影响，如气候，病虫害和植物的生理变化。在对影响咖啡产量的因素进行进一步长期研究之前，我们发现遮荫树提供了足够的生态系统服务，即使是在集约化管理的种植园中，也有理由将其整合。
Intensively managed cropping systems with emphasis on productivity of the main crop can benefit from additional ecosystem services brought by integration of trees in the system but potential drawbacks must also be accounted for. In an on-farm study, we used a variety of plant, soil and water- related variables to assess the effect of Erythrina spp. and Musa spp. on the provision of ecosystem services in productive, high-quality Coffea arabica plantations in Costa Rica. We found 1) no significant effect of shade trees on coffee production overall; 2) evidence that shade trees do affect flowering and subsequent cherry development, with effects strongly dependent on climate and annual variations in coffee plant physiology; 3) Erythrina shade trees significantly increased soil litter and relative infiltration rate of water in the soil, both linked to soil conservation and decrease in erosion; 4) even in highly fertilized environments, Erythrina trees do fix N which was taken up by adjacent coffee plants. The lack of significant negative effect of shade trees on overall coffee yield and the observation of the provision of other useful services was not unexpected, because of 1) the low density of shade trees in the study site (100-350 trees/ha pruned twice a year on average) and 2) the sensitivity of coffee yields to other interacting effects such as climate, pests and diseases and physiological variations in the plant. Pending further long-term research into the factors affecting coffee yield, we find shade trees provide sufficient ecosystem services to justify their integration in even intensively managed plantations.