摘要: |
【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。 |
关键词: 栓皮栎 秦岭南坡 近自然经营 间伐强度 结实 种子品质 |
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基金项目:国家林业公益性行业科研专项(201004011);国家自然科学基金项目(30872018);陕西省重点基础研究项目(2009JZ005) |
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Effects of thinning intensity on fruiting quantity and quality of Quercus variabilis forest on the south slope of Qinling Mountains |
RAN Ran,ZHANG Wen-hui,ZHOU Jian-yun,et al
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Abstract: |
【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. |
Key words: Quercus variabilis the south slope of Qinling Mountains close-to-natural forest management thinning intensity fruiting seed quality |