Among the ecosystem services provided by salt marshes is the use of their natural vegetation as pastures for livestock production. As a result, the prediction of biomass productivity can be of great interest for the sustainable management of these environments. Evapotranspiration is one of the variables most used to estimate the yield of green biomass in pastures and crops, which to date has not been examined for natural environments such as salt marshes. We studied the aboveground biomass and species cover variability for two categories (erect and sward plants) in three plots affected by low, moderate, and high cattle grazing. Erect biomass was associated only with Spartina densiflora while for sward plants it gathered a diverse set of prostrate and stoloniferous species with high seasonal turnover. The evapotranspiration was estimated with a coupled surface resistance—Penman-Monteith model developed for these environments. The biomass of the plant categories shows different growth response according to livestock impact. S. densiflora has a slow-growing response after cattle consumption, even with high evapotranspiration. On the other hand, sward plants respond with biomass overproduction to livestock consumption, and a significantly positive relationship to evapotranspiration rate.

中文翻译：

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牲畜放牧对南半球盐沼，布宜诺斯艾利斯（阿根廷）蒸散-植被生物量关系的影响

盐沼提供的生态系统服务包括利用其天然植被作为畜牧业生产的牧场。因此，生物质生产力的预测对于这些环境的可持续管理可能具有重要意义。蒸散是最常用于估计牧场和作物中绿色生物量产量的变量之一，迄今为止尚未对盐沼等自然环境进行过研究。我们研究了受低、中和高放牛影响的三个地块中两类（直立植物和草丛植物）的地上生物量和物种覆盖率变异性。直立生物量仅与 Spartina densiflora 相关，而对于草本植物，它收集了一系列具有高季节性周转率的匍匐和匍匐茎物种。蒸散量是通过耦合表面阻力来估计的——为这些环境开发的 Penman-Monteith 模型。根据牲畜影响，植物类别的生物量显示出不同的生长响应。S. densiflora 在牛食用后生长缓慢，即使蒸发量很大。另一方面，草地植物对牲畜消费的生物量过剩做出反应，并与蒸散率呈显着正相关。