Applied Plant Ecology, Institute for Conservation Research, San Diego Zoo Global, 15600 San Pasqual Valley Road, Escondido, CA 92027, USA.
Environ Manage. 2012 Jan;49(1):142-50. doi: 10.1007/s00267-011-9777-2. Epub 2011 Nov 1.
In recent years, the use of postfire mulch treatments to stabilize slopes and reduce soil erosion in shrubland ecosystems has increased; however, the potential effects on plant recovery have not been examined. To evaluate the effects of mulching treatments on postfire plant recovery in southern California coastal sage scrub, we conducted a field experiment with three experimental treatments, consisting of two hydromulch products and an erosion control blanket, plus a control treatment. The area burned in 2007, and treatments were applied to six plot blocks before the 2008 growing season. Treatment effects on plant community recovery were analyzed with a mixed effects ANOVA analysis using a univariate repeated measures approach. Absolute plant cover increased from 13 to 90% by the end of the second growing season, and the mean relative cover of exotic species was 32%. The two hydromulch treatments had no effect on any plant community recovery response variable measured. For the erosion control blanket treatment, the amount of bare ground cover at the end of the second growing season was significantly lower (P = 0.01), and greater shrub height was observed (P < 0.01). We conclude that postfire mulch treatments did not provide either a major benefit or negative impact to coastal sage scrub recovery on the study area.
近年来，在灌木生态系统中使用火灾后覆盖物处理来稳定边坡和减少土壤侵蚀的做法有所增加；然而，尚未研究其对植物恢复的潜在影响。为了评估覆盖物处理对加利福尼亚州南部沿海莎草灌丛火灾后植物恢复的影响，我们在野外进行了一项实验，有三个实验处理，包括两种水力喷播产品和一个侵蚀控制毯，以及一个对照处理。该地区于 2007 年发生火灾，在 2008 年生长季节之前将处理应用于六个地块。使用单变量重复测量方法的混合效应方差分析来分析处理对植物群落恢复的影响。在第二个生长季节结束时，植物盖度绝对增加了 13%至 90%，外来物种的平均相对盖度为 32%。两种水力喷播处理对所测量的任何植物群落恢复响应变量均无影响。对于侵蚀控制毯处理，第二个生长季节结束时的裸地覆盖量显著降低（P=0.01），观察到的灌木高度更高（P<0.01）。我们的结论是，火灾后覆盖物处理在研究区域对沿海莎草灌丛恢复既没有提供重大益处，也没有产生负面影响。
