Hobbs R J, Gulmon S L, Hobbs V J, Mooney H A
Division of Wildlife and Rangelands Research, CSIRO, LMB 4, PO, 6056, Midland, WA, Australia.
Department of Biological Sciences, Stanford University, 94305, Stanford, CA, USA.
Oecologia. 1988 Mar;75(2):291-295. doi: 10.1007/BF00378612.
Application of slow release fertiliser to small (0.5x1 m) plots within a serpentine annual grassland community led to significant increases in above-ground biomass and a shift in species relative abundances. In fertilised plots the native forb species which usually dominate the grassland were almost totally replaced by grasses. In the years following initial fertiliser application, a heavy mulch formed from the previous year's grass growth allowed establishment of grass species such as Bromus mollis but significantly reduced forb establishment. Gopher disturbance of fertilised plots in the second and third years of the experiment effectively removed the grass mulch and allowed re-establishment of forb species.
在蛇纹石一年生草地群落内的小地块（0.5×1米）施用缓释肥料，导致地上生物量显著增加，物种相对丰度发生变化。在施肥地块，通常在草地中占主导地位的本地草本植物几乎完全被禾本科植物取代。在首次施肥后的几年里，上一年禾本科植物生长形成的厚厚的覆盖物有利于诸如软雀麦等禾本科物种的生长，但显著减少了草本植物的生长。在实验的第二年和第三年，对施肥地块的囊鼠干扰有效地去除了禾本科植物覆盖物，使草本植物得以重新生长。
