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以海南省琼中、昌江、文昌、乐东4个地区桉树人工林为研究对象,对比分析了不同雨量区域的桉林土壤水分、林下生物量以及它们的相关关系。结果表明:琼中、文昌桉树林土壤含水率与林下层生物量之间存在简单的正、负相关,但均未达到显著水平(p>0.05),昌江20~40cm土壤含水率与根冠比呈极显著正相关(p<0.01),与凋落物生物量呈显著正相关(p<0.05),0~60cm土壤含水率与凋落物存在显著正相关(p<0.05),乐东0~20cm土壤含水率与活体地下部生物量存在显著正相关(p<0.05),凋落物生物量均与0~20cm、20~40cm、0~60cm土壤含水率呈显著正相关(p<0.05),沿“琼中—昌江—文昌—乐东”一线,桉树林下层生物量随土壤含水量降低而呈“V”变化。
Taking the Eucalyptus plantations in four districts of Qiongzhong, Changjiang, Wenchang and Ledong of Hainan Province as the research objects, the soil moisture and undergrowth biomass of Eucalyptus globulus in different rainfall areas were compared and analyzed. The results showed that there was a simple positive and negative correlation between the soil moisture content of the eucalyptus forest and the biomass of the lower forest in Qiongzhong and Wenchang, but none of them reached the significant level (p> 0.05). The soil water content of 20 ~ (P <0.01), and significantly correlated with litter biomass (p <0.05). Soil moisture at 0-60 cm was significantly and positively correlated with litter (p <0.05), while Ludong 0-20 cm There was a significant positive correlation (p <0.05) between the soil water content and the biomass in the living body, and the litter biomass was positively correlated with the soil water content in 0-20 cm, 20-40 cm and 0-60 cm (p <0.05) Under the “Qiongzhong - Changjiang - Wenchang - Ledong” line, the lower biomass of Eucalyptus forest changed with the decrease of soil water content.