人工造林对冀北林草交错带土壤碳储量的影响
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1.河北农业大学;2.河北农业大学林学院 河北 保定

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Effects of afforestation on soil carbon storage in forest steppe ecotone of northern Hebei Province
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College of Forestry Agricultural University of Hebei Baoding

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    摘要:

    [目的]探究人工造林对冀北林草交错带土壤有机碳储量的影响以及不同人工林土壤碳储量是否具有明显差异,为提升该地区陆地生态系统碳汇提供科学依据。[方法]以御道口地区的樟子松和华北落叶松人工林为研究对象,以未造林地为对照,采用方差分析对不同类型人工林土壤有机碳含量和碳储量进行了研究。[结果](1)御道口地区未造林地的土壤有机碳含量与植被生物量呈明显的正相关关系;(2)御道口地区不同未造林地的土壤有机碳储量具有明显差异,在31.78t/hm2~127.56t/hm2之间(P < 0.05);(3)华北落叶松(Larix gmelinii-principis-rupprechtii)和樟子松(Pinus sylvestris var.mongolica)人工林的土壤碳含量和碳储量显著低于未造林地I,高于未造林地II和未造林地III(P < 0.05),华北落叶松人工林的土壤碳含量和碳储量又显著高于樟子松人工林(P < 0.05),0-60cm深土壤有机碳储量由高到低依次为未造林地I(127.56 t/hm2)>华北落叶松人工林(105.26 t/hm2)>樟子松人工林(75.52 t/hm2)>未造林地II(56.06 t/hm2)>未造林地III(31.78 t/hm2);(4)华北落叶松的土壤有机碳含量和碳储量在各个土层上均随年龄的增加表现出逐渐增加的趋势,由大到小依次为26-30a、21-25a和16-20a,各林龄0-60cm的土壤有机碳储量分别为159.73t/hm2112.29t/hm2105.26t/hm2樟子松人工林的土壤有机碳含量和碳储量随着年龄的增加,表现为先下降后增加的趋势,6-10a、11-15a 、16-20a和>20a樟子松人工林0-60cm的土壤有机碳储量分别为79.38t/hm254.24t/hm275.52t/hm282.24t/hm2[结论]人工造林对土壤有机碳含量和碳储量的影响与初始条件有关,且与造林树种有关,在御道口地区,使用华北落叶松在土壤有机碳含量较低的地段进行造林能够有效提升土壤碳储量。

    Abstract:

    [Objective] In order to improve the carbon sequestration capacity of terrestrial ecosystem, the impact of artificial afforestation on soil organic carbon storage in forest steppe ecotone of northern Hebei and the differences in soil carbon storage among the different plantations were studied. [Methods]Pinus Sylvestris var. mongolica and Larix gmelinii var. principis-rupprechtii plantations were selected as the research objects in the Yudaokou area located in forest steppe ecotone, with unplanted land as controls, the SOC(soil organic carbon) content and SOC storage of different terrestrial ecosystems were studied using variance analysis. [Results] (1)There was a significant positive correlation between soil organic carbon content and vegetation biomass in uncultivated forests in the Yudaokou area.(2)There were significant differences in soil organic carbon storage in different unplanted land in Yudaokou area, ranging from 31.78 t/hm2 ~ 127.56 t/hm2 (P < 0.05).(3)The larch plantation and scotch pine plantation had significantly lower soil carbon content and SOC storage than unplanted land I , but higher than that of unplanted land II and unplanted land III (P < 0.05). The larch plantation had significantly higher soil carbon content and SOC storage than scotch pine plantation (P < 0.05). The order of SOC storage from high to low in the 0-60 cm soil layer was unplanted land I (127.56 t/hm2) > larch plantation (105.26 t/hm2) > scotch pine plantation (75.52 t/hm2 )> unplanted land II (56.06 t/hm2 )> unplanted land III (31.78 t/hm2).(4) The soil organic carbon content and carbon storage of North China larch show a gradually increasing trend with age in each soil layer, from large to small, they are 26-30a, 21-25a, and 16-20a, respectively. The soil organic carbon storage of 0-60cm in each forest age is 159.73t/hm2, 112.29t/hm2, and 105.26t/hm2, respectively; The soil organic carbon content and carbon storage of scotch pine plantations show a trend of first decreasing and then increasing with age. The soil organic carbon storage of scotch pine plantations from 6-10a, 11-15a, 16-20a, and > 20a at 0-60cm depth is 79.38t/hm2, 54.24t/hm2, 75.52t/hm2, and 82.24t/hm2, respectively. [Conclusion] The impact of afforestation on soil organic carbon content and storage is related to initial conditions, and there are significant differences in soil organic carbon content and carbon storage among different types of artificial forests. In the Yudaokou area, using larch for afforestation in the place with lower soil organic carbon content and storage can obtain higher soil carbon storage.

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  • 收稿日期:2024-06-15
  • 最后修改日期:2024-10-21
  • 录用日期:2024-10-22
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