Plant production decreases more than litter decomposition with rising aridity in drylands

Climate change increases aridity in many drylands worldwide, which has significant consequences for ecosystem functioning and may reduce carbon sequestration. However, responses of major carbon cycle processes in drylands, including primary production and decomposition, to increasing aridity remain poorly understood. In this study, we assessed the quantitative effects of precipitation and the underlying impacts of functional traits on aboveground net primary production (ANPP) and plant litter decomposition in herbaceous Mediterranean plant communities. A dataset encompassing a wide range of precipitation (~50-1000 mm) was generated by selecting four field sites along a natural precipitation gradient, applying rainfall manipulations, and conducting the experiment over 3-9 years. Across the entire dataset, ANPP and decomposition decreased non-linearly with declining precipitation, showing steeper reductions at low compared to high precipitation levels. Notably, above ~400 mm, the two proc..., , # Plant production decreases more than litter decomposition with rising aridity in drylands

Dataset DOI: [10.5061/dryad.573n5tbm5](10.5061/dryad.573n5tbm5)

## **Study Description**

The dataset was collected within a long-term field experiment along a precipitation gradient in Israel, covering four sites with mean annual rainfall between 90 and 780 mm. The study focused on herbaceous plant communities. At two sites, precipitation was experimentally manipulated (+30% and –30% rainfall), while the other two sites served as controls.

Aboveground net primary production (ANPP) was assessed annually by destructive biomass harvest in permanent plots over 9 years. Litter decomposition was measured using litterbags deployed in the field and in reciprocal transplantation experiments across sites. Plant and litter functional traits were determined for dominant species and representative litter samples. The data include biomass production, decomposition rates, plant and litter chemical and struc...,

气候变化加剧了全球众多干旱地区（drylands）的干旱化程度，这对生态系统功能产生了显著影响，并可能降低碳固存（carbon sequestration）能力。然而，人们对干旱地区主要碳循环过程（包括初级生产与有机质分解）对干旱化加剧的响应仍知之甚少。本研究评估了降水的定量效应，以及功能性状（functional traits）对地中海草本植物群落地上净初级生产力（aboveground net primary production, ANPP）和植物残体分解的潜在影响。
本数据集通过沿自然降水梯度选取4个野外样地，开展降水调控实验，并持续3至9年的野外试验，构建了覆盖约50~1000毫米降水范围的数据集。对全部数据集的分析显示，ANPP与分解速率随降水减少呈非线性下降趋势，且在低降水水平下的降幅较高降水水平更为显著。值得注意的是，当降水水平高于约400毫米时，两项指标的变化趋势存在差异（原文截断）。
# 干旱地区干旱化加剧时植物生产力降幅大于残体分解
数据集DOI: [10.5061/dryad.573n5tbm5](10.5061/dryad.573n5tbm5)

## 研究概况
本数据集采集自以色列沿降水梯度设置的长期野外实验，共涵盖4个年均降雨量介于90至780毫米的样地，研究对象为草本植物群落。其中2个样地开展了降水调控实验（分别增加30%与减少30%降雨量），剩余2个样地作为对照。
地上净初级生产力（ANPP）通过在永久样地内连续9年进行破坏性生物量收获进行年度评估。植物残体分解速率采用原位野外分解袋（litterbags）法，并通过跨样地的互置移植实验（reciprocal transplantation experiments）进行测定。研究针对优势物种与代表性残体样本测定了植物与残体的功能性状。本数据集包含生物量生产、分解速率、植物与残体的化学及结构（原文截断）相关数据……