Jiang Hao-Tian, He Heng-Guo, Xu Xiao, Dong Ting-Fa
School of Life Sciences, China West Normal University, Nanchong 637009, Sichuan, China.
Key Laboratory of Southwest China Wildlife Resources Conservation, Ministry of Education, Nanchong 637009, Sichuan, China.
Ying Yong Sheng Tai Xue Bao. 2021 Jan;32(1):66-72. doi: 10.13287/j.1001-9332.202101.010.
Although plant-plant interactions have been intensively studied, few studies examined sex-related neighbor interactions in dioecious plant species. Here, we investigated the sexual diffe-rences in biomass accumulation, and analyzed the sexual neighbor effects and yields of sexual combination in seedlings under the treatments of inter- and intra-sex neighbors and soil sterilization. The results showed that biomass accumulation of decreased in both of sexes when grown with an intra-sex neighbor. Females increased biomass accumulation under non-sterilization condition when grown with an inter-sex neighbor. Soil sterilization decreased biomass accumulation in both sexes of these plants, especially for females. Soil sterilization treatments did not significantly affect intra-sex interactions, but neutralized the positive effects in females and led the effects in males to turn from neutral to negative in inter-sex neighbors. The highest biomass in female-male combination under non-sterilization condition and the lowest biomass in male-male combination under sterilization condition were observed among combinations. These results indicated that the growth of female and male differed in their responses to their sexual neighbors, and that such neighbor effects were affected by soil microorganism. Our results could contribute to improve the productivity of poplar plantations in silviculture.
尽管植物间的相互作用已得到深入研究，但很少有研究探讨雌雄异株植物物种中与性别相关的邻体相互作用。在此，我们研究了生物量积累的性别差异，并分析了在同性和异性邻体以及土壤灭菌处理下，幼苗中性别邻体效应和性别组合的产量。结果表明，与同性邻体一起生长时，两性的生物量积累均下降。在未灭菌条件下，与异性邻体一起生长时，雌性的生物量积累增加。土壤灭菌降低了这些植物两性的生物量积累，尤其是雌性。土壤灭菌处理对同性相互作用没有显著影响，但消除了雌性中的积极效应，并使异性邻体中雄性的效应从无影响变为负面影响。在所有组合中，未灭菌条件下雌-雄组合的生物量最高，灭菌条件下雄-雄组合的生物量最低。这些结果表明，雌性和雄性杨树对其性别邻体的反应不同，且这种邻体效应受土壤微生物影响。我们的结果有助于提高杨树人工林在造林学中的生产力。
