Tree species diversity and carbon stock of trees on farms in the Nicaragua-Honduras Sentinel Landscape

The current data sets were generated as part of the master thesis entitled “Diversity and carbon storage in two sites with different degrees of agriculture intensification in Nicaragua”, done by Willan Caicedo as part of the CATIE master program in Agroforestry and Sustainable Agriculture 2014-2016. The study was part of a multidisciplinary program in the Nicaragua-Honduras Sentinel Landscape that aims to understand the presence and contribution of tree on farm to ecosystem processes, food security and livelihood (see detail in the website www.paisagecentinela.org). Complementary, spatial information for this study is available in the www.landscapeportal.org. The study was done in two Nicaraguan municipalities, El Tuma - La Dalia and Waslala. In each site 45 farms were selected and their six predominant land uses (plot) were sampled: coffee plantations, cacao tree, living fences, basic grains, pastures and home gardens. In each plot tree, banana and palm individuals with a diameter at breast height (DBH) ≥ 9.9 cm (≥ 4.8 cm DBH trees in the case of Citrus sp.) were recorded. Every individual was identified in the field using its local or scientific name. For species with difficult identification plant material was collected and sent to the Herbarium of the National Autonomous University of Nicaragua, UNAN-León for subsequent taxonomic identification. Other complementary variables measured at individual level were: diameter at breast height (DBH; 1.30 m above the ground); commercial stem height (from the ground to the usable height), and total height of individuals (from the ground to the apex). When individuals have several stems, each one were independently measured and then the mean square diameter per individual was calculated. For Citrus trees that were highly branched below 1.30 m above the ground, the diameters was measured at 0.30 m above ground. (2015) The data set has five files and each one with their respective description

本数据集系Willan Caicedo于2014-2016年参与中美洲热带农业研究与教育中心（CATIE）农林业与可持续农业硕士项目时，为完成题为《尼加拉瓜两个不同农业集约化程度站点的生物多样性与碳储量》的硕士论文所生成的配套研究数据。本研究属于尼加拉瓜-洪都拉斯哨兵景观（Nicaragua-Honduras Sentinel Landscape）多学科项目的一部分，该项目旨在探究农田树木对生态系统过程、粮食安全与民生的贡献与存在价值（详细信息可访问官网www.paisagecentinela.org）。此外，本研究的空间信息可通过www.landscapeportal.org获取。研究区域覆盖尼加拉瓜的两个市镇：El Tuma - La Dalia与Waslala。在每个站点共选取45个农场，对其6种主要土地利用类型（地块）开展采样：咖啡种植园、可可种植园、活篱笆、主食谷物种植田、牧场与家庭菜园。在每个地块中，记录胸径（Diameter at Breast Height，DBH）≥9.9厘米的乔木、香蕉与棕榈个体（柑橘属（Citrus sp.）个体的胸径阈值为≥4.8厘米）。所有个体均在野外通过当地名或学名进行识别；对于难以鉴定的物种，采集植物标本并送至尼加拉瓜国立自治大学莱昂分校（UNAN-León）标本馆开展后续分类学鉴定。在个体水平上测量的补充变量还包括：胸径（DBH，距地面1.30米处）、商用茎高（从地面至可利用高度）以及个体总高度（从地面至植株顶端）。若个体存在多个茎干，则分别测量每个茎干的直径，随后计算该个体的平均平方直径。对于距地面1.30米以下分枝较多的柑橘类树木，在距地面0.30米处测量其直径。本数据集生成于2015年，共包含5个文件，每个文件均配有对应的说明文档。