Protected areas of biodiversity in South Africa

The results of the biodiversity Network having been run through C-Plan and Marxan by a consultant Grunt Benn. The biodiversity Network takes into account City vegitation types, protea atlas and crew dataand potential threats. National targets were used. The C-Plan and Marxan steps followed in short are as such : 1. Select all high and medium value sites with Irreplaceability =100 2.Run Minset algorithm with only high and medium sites( note one of the tie breaking rules in the minset assessed whether tied sites were located within one of the five corridors City Biodiversity experts mapped) 3. Return low value sites to list of available sites and then select all 100% Irreplaceable sites ( Note : in these three steps all available targets are met ) 4. Moved input data into Maxan, sets all types selected in step 1 and 2 as conserved ( in addition to the existing protected areas). Then run Marxan with a Boundary Length Mdifier selecting from remaining sites to meet outstanding targets. This step is similar to step 3, except for the inclusion of the BML. This step thus selected more sites than a simple C- Plan selection to meet the same outstanding target value. Sites were then characterised into the Critical Biodiversity Area catagories. Layer has been run through C- Plan and Marxan software to prioritise indeginouse vegitation ramnants based on various factors. Threaths to Biodiversity Network included. Alterations done to exclude known developed sites and add left out sites.某咨询人格伦特·本恩（Grunt Benn）已通过C-Plan与Marxan软件对生物多样性网络（Biodiversity Network）的运算结果进行了处理。该生物多样性网络综合考量了城市植被类型、海神花图谱（protea atlas）、调查组数据以及潜在威胁因素，本次分析采用了国家级保护目标。 本次所遵循的C-Plan与Marxan操作步骤简述如下： 1. 选取所有不可替代性（Irreplaceability）值为100的高、中等价值样地； 2. 仅针对高、中等价值样地运行最小集（Minset）算法（注：最小集算法中的一项破局规则为，评估存在平局的样地是否位于城市生物多样性专家所划定的五条廊道之一范围内）； 3. 将低价值样地重新纳入可用样地列表，随后选取所有不可替代性值为100%的样地（注：上述三步可完成全部既定保护目标）； 4. 将输入数据导入Marxan软件，将步骤1与步骤2中选定的所有样地类型设为已保护（叠加现有保护区域）。随后以边界长度修正系数（Boundary Length Modifier，下文简称BML）为参数，从剩余样地中选取样地以达成未完成的保护目标。本步骤与步骤3类似，但新增了BML的应用。相较于单纯的C-Plan选样，本步骤为达成相同的未完成目标值，会选取更多的样地。 随后将所有样地归类至关键生物多样性区域（Critical Biodiversity Area）类别中。本数据图层已通过C-Plan与Marxan软件运算，基于多种因素对本土植被剩余斑块（indigenous vegetation remnants）进行优先级排序，并纳入了针对生物多样性网络的威胁因素。已对数据进行调整，剔除已知已开发的样地，并补充遗漏的样地。