Above-ground biomass and productivity in the Montado: From herbaceous to shrub dominated communities
Above-ground biomass and productivity in the Montado: From herbaceous to shrub dominated communities
复制标题
DOI：
10.1016/j.jaridenv.2008.12.009
复制
发表时间：
2009-04-01
影响因子：
2.7
通讯作者：
Freitas, H.
中科院分区：
文献类型：
--
作者：
Castro, H.;Freitas, H.
我们的研究集中在地上生物量和净初级生产力（ANPP）在葡萄牙南部的Montado放弃的影响。蒙塔多有着悠久的人类管理历史，通过清理、耕作和放牧来控制灌木的入侵。当这些停止时，它被地中海的matorral物种入侵。我们假设生活型优势的变化会影响生物量和生产力，但总生物量预计会增加，对ANPP的影响不太清楚。我们通过测定沿着土地利用强度递减梯度（从粗放放牧到20年弃耕）的地上生物量和ANPP来验证我们的假设。此外，我们发现，草本植物ANPP的减少超过补偿灌木ANPP的增加，在较长时间的地块放弃，导致总ANPP显着增加。这一增长是密切相关的增加，在覆盖的岩蔷薇，先锋物种，殖民退化地区，并形成一个第一阶段的木本群落演替。(C)2008爱思唯尔有限公司保留所有权利。
Our study was focused on the effect of abandonment on above-ground biomass and net primary productivity (ANPP) in a Montado in Southern Portugal. The Montado has a long history of human management and control of invasion by shrubs is achieved by clearing, ploughing and grazing. When these cease, it is invaded by Mediterranean matorral species. We hypothesized that the change in life form dominance would affect both biomass and productivity, but while the total biomass was expected to increase, the effects on ANPP were less clear. We tested our hypothesis by determining above-ground biomass and ANPP along a gradient of decreasing land use intensity, ranging from extensive grazing to 20 years of abandonment.Above-ground biomass increased with abandonment, which was related with the increase in shrub cover. In addition, we found a decrease in herbaceous ANPP that was more than compensated by an increase in shrub ANPP in plots abandoned for longer time, resulting in a significant increase in total ANPP. This increase was strongly related with the increase in the cover of Cistus ladanifer, a pioneer species that colonises degraded areas and forms one of the first stages of succession of woody communities. (C) 2008 Elsevier Ltd. All rights reserved.