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- 2015
间伐强度对秦岭南坡栓皮栎林结实数量和品质的影响
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Abstract:
【目的】研究不同间伐强度对秦岭南坡栓皮栎林结实数量和品质的影响，了解间伐对栓皮栎林可持续发育的作用。【方法】2011-07，以秦岭南坡商洛地区近自然经营的栓皮栎中龄纯林为研究对象，按照不同间伐强度30%，20%，10%，0(对照)处理后，分析间伐5年后栓皮栎林的平均单株结实量、林分总结实量、种子在树冠上的空间分布、种子特征以及种子萌发率等。【结果】栓皮栎林结实母树比例随着间伐强度的增加而增加，表现为30%>20%>10%>对照；林分总结实量在间伐强度达到30%时比对照组增加最多，增加了8.4%；平均单株结实量树冠上层占73.8%，下层占26.2%，树冠阳面结实最多，占62.2%；不同间伐强度对栓皮栎的种子大小、千粒质量及种子萌发均有影响，间伐强度30%时种子品质最优、室内恒温发芽率最高。【结论】对于郁闭度≥0.80的栓皮栎中龄林，以间伐强度为30% (郁闭度保留0.6)最有利于栓皮栎林的结实和种子品质的提高，能够促进栓皮栎天然林的可持续发育。
【Objective】This study aimed to research the effects of thinning intensity on fruiting quantity and quality of Quercus variabilis forest on the south slope of Qinling Mountains.【Method】Q.variabilis half-mature and pure forests under close-to-natural management in Shangluo,the south slope of Qinling Mountains were selected as the object in July 2011.Based on different thinning intensities (30%,20%,10% and 0（CK)),the individual fruiting status,the total number of stand fruits,seeds spatial distributions,seeds characteristics and seeds germination rates of Q.variabilis forests 5 years after thinning were analyzed.【Result】The average fruiting number of individual plant increased with the increasing intensity,and the order of different treatments was 30%>20%>10%>0（CK）.The total number of stand fruits of 30% thinning intensity increased the most by 8.4% compared to the control group.The upper fruiting number of the average single plant accounted for 73.8%,while the lower part accounted for 26.2%.The sunny side of canopy layer set the most fruits with the ratio of 62.2%.The seed size,1 000-seed mass,and seed germination of Q.variabilis were different under different thinning intensities,and seed quality and heated indoor germination rate were the best when the thinning intensity was 30%.【Conclusion】The thinning intensity of 30% (canopy density keep 0.6) was most conducive to the improvement of fruiting and seed quality of Q.variabilis half mature forest,and it could promote the sustainable development of Q.variabilis natural forest
