Tools for assessing hydrologic challenges and restoration potential of reservoir deltas: case studies from Southern California

Data from 23 River Partners restoration project sites in 8 counties across California were included in this dataset (Figure 4), representing a range of soil types and environmental conditions. Projects had been planted in 11 different years ranging from 2003 to 2018, representing a variety of precipitation and climate conditions. Plant propagules were either seed (ex., Quercus spp.), 18-inch cuttings buried to 12-inches (ex., Salix spp.), or one-gallon container plants. During the establishment phase, plants were maintained using horticultural restoration methods including highly aggressive mechanical or chemical weed control, and frequent supplemental watering using drip or flood irrigation based on soil conditions and evapotranspiration demand. Height measurements were taken in 12 different years from 2005 to 2020, within 12 to 43 months after planting. To select plants for measurement, we randomly established 20m x 50m monitoring plots in each restoration project at a rate of one plot per 5-20 acres. Plots were at least 10 meters from the project boundary, and oriented with the long axis (50m) facing north. All trees and shrubs within the plot were measured. Height was measured by placing a Stadia rod at the plant base and recording the tallest branch height.

本数据集纳入了加利福尼亚州8个县的23个河流合作伙伴（River Partners）修复项目场地的数据（图4），涵盖了多样的土壤类型与环境条件。这些项目的种植年份介于2003至2018年，共涉及11个不同年份，覆盖了不同的降水与气候条件。植物繁殖体包括三类：种子（如栎属Quercus spp.）、埋深12英寸的18英寸插条（如柳属Salix spp.），以及1加仑容器苗。在定植阶段，采用园艺修复管护措施对植株进行培育，包括高强度机械或化学除草，并依据土壤状况与蒸散（evapotranspiration）需求，通过滴灌或漫灌方式进行频繁补水。2005至2020年共12个年份开展了植株高度测量工作，所有测量均在种植后12至43个月内完成。为选取待测植株，我们在每个修复项目中随机布设20米×50米的监测样地，布设比例为每5至20英亩设置1个样地；样地需距离项目边界至少10米，且样地长轴（50米方向）朝向正北。对样地内所有乔木与灌木进行高度测量，测量方式为将视距尺（Stadia rod）置于植株基部，记录最高枝条的高度。