中文摘要：

设计光照和养分环境的析因组合盆栽试验，研究不同光照条件下马尾松、木荷和马褂木对异质养分环境的生长适应性反应及觅养行为差异．结果表明：全光照下马尾松和木荷在异质养分环境中较同质养分环境具有较大的生长优势，其根系干物质量分别增加达99．5％和66．7％，而马褂木在同质养分环境中生长表现较好．遮阳处理显著改变了木荷根系的广布性、觅养精确性及养分吸收效率，降低了其在异质养分环境中的生长优势；遮阳对马尾松觅养行为的影响不如木荷显著，其在异质养分环境中的生长仍保持一定的优势，推测与马尾松在富养斑块中有明显的根系增生和较高的养分吸收效率有关；遮阳对马褂木的觅养精确性和反应敏感度的影响相对较小，未改变其对养分环境的生长反应式样．马尾松、木荷和马褂木不仅在根系觅养机制及觅养行为上具有显著遗传差异，而且受光照条件影响变化的模式也各不相同，因此人工造林时应实施不同的栽培技术措施来提高林分生产力．

英文摘要：

A factorial combination pot experiment was designed to study the growth response and foraging behavior of three South China forestation species Pinus massoniana, Schima superba and Liriodendron chinense under heterogenous nutrient envionment and different light conditions. The resuits demonstrated that under full light, the plant height and biomass of P. massoniana and S. superba were enhanced in heterogenous nutrient environment, with the root biomass increased by 99.5% and 66.7%, respectively, compared with that in homogenous environment; while L. chinense exhibited singnificant growth benefits in homogenous environment. The root scale, foraging precision, and nutrient uptake of S. superba reduced markedly under shading, which in tum decreased the growth benefits in heterogenous nutrient environment. The influence of shading was weaker on P. due to its root than on S. superba, still with some growth benefits for P. massoniana proliferation and enhanced nutrient uptake in nutrient rich patch. There was a slight influence of shading on the foraging precision and sensitivity of L. chinense root, with no growth response pattem change to heterogenous nutient environment occurred. It was concluded that three tree species not only differed in the inheritance of root foraging mechanism and behavior, but also varied in the response pattern to light condition. Therefore, different measures should be adopted in forestation with the three tree species to enhance the forest productivity.