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草业学报 ›› 2014, Vol. 23 ›› Issue (6): 36-44.DOI: 10.11686/cyxb20140605

• 论文 • 上一篇    下一篇

半干旱沙地生境变化对植物地上生物量及其碳、氮储量的影响

周欣1,2,*,左小安1,赵学勇1,王少昆1,罗永清1,2,岳祥飞1,2,张腊梅1,2   

  1. 1.中国科学院寒区旱区环境与工程研究所奈曼沙漠化研究站,甘肃 兰州730000;
    2.中国科学院大学,北京100049
  • 收稿日期:2014-06-03 出版日期:2014-12-20 发布日期:2014-12-20
  • 通讯作者: E-mail:candicezhouxin@gmail.com
  • 作者简介:周欣(1991-),女,安徽淮北人,在读硕士
  • 基金资助:
    国家自然科学基金项目(40171414),中国科学院“百人计划”项目(Y451H31001),中国科学院知识创新工程重要方向项目(KZCX2-EW-QN313)和中国科学院“青年创新促进会”项目(1100000036)资助

Effect of change in semiarid sand dune habitat on aboveground plant biomass, carbon and nitrogen

ZHOU Xin1,2,ZUO Xiao-an1,ZHAO Xue-yong1,WANG Shao-kun1,LUO Yong-qing1,2,YUE Xiang-fei1,2,ZHANG La-mei1,2   

  1. 1.Naiman Desertification Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2014-06-03 Online:2014-12-20 Published:2014-12-20

摘要: 研究了科尔沁沙地沙丘固定过程中的流动沙丘、半固定沙丘和固定沙丘以及草地4种生境类型的植物地上生物量及其碳、氮含量与储量特征。结果表明,沙地生境变化对植物叶干重、枝干重、总生物量及其碳、氮含量与储量均有显著影响(P<0.01);固定沙丘的叶干重、枝干重、总生物量及其碳氮储量均大于流动沙丘与半固定沙丘,草地的叶干重、枝干重、总生物量、枝和总的碳储量、枝的氮储量均小于固定沙丘而大于流动沙丘;半固定沙丘叶、枝及总碳含量与枝的碳储量大于流动沙丘,而叶、枝及总氮含量小于流动沙丘。一年生植物分别占流动沙丘、固定沙丘和草地总生物量的63.99%,79.28%,70.86%;灌木占半固定沙丘总生物量的73.15%;C3植物生物量分别占流动、半固定、固定沙丘和草地总生物量的39.99%,90.87%,96.01%和82.67%。固定沙丘上的一年生植物和C3植物的生物量、碳氮储量在4个生境中最高;半固定、固定沙丘和草地中C3植物碳含量及其储量、氮储量均高于C4植物。沙丘固定过程中生物量及其碳氮储量逐渐增加,固定沙丘植被具有较大的碳氮固存潜力,一年生植物、C3植物对其碳氮的固存具有重要的贡献作用;沙丘固定过程中C3植物对C4植物生物量的下降具补偿作用。

Abstract: This study examined the characteristics of aboveground plant biomass, carbon (C) content, nitrogen (N) content and total C and N of four different habitats; mobile, semi-stable and stable dunes (three stages of sand dune stabilization) and natural grassland at Horqin, Inner Mongolia, in Northern China. The change in sand dune habitat had significant impacts on leaf dry weight, branch dry weight, total biomass, C and N contents and total C and N. Leaf and branch dry weight, total biomass, % C and N and total C and N in the fixed dune were higher than those in mobile and semi-stable dunes. Total biomass, leaf and branch dry weight, total branch C, total biomass C and total branch N in the grassland were lower than those in the stable dune, but higher than those in the mobile dune. The leaf and branch C %, total C % and total branch C in the semi-stable dune were higher than those in the mobile dune, while leaf and branch N % and total N in the semi-stable dune were lower than the mobile dune. Annual plant species separately accounted for 63.99%, 79.28%, 70.86% of the total biomass in the mobile dune, stable dune and grassland respectively, while shrubs accounted for 73.15% of the total biomass in the semi-stable dune. C3 plant species contributed 39.99%, 90.87%, 96.01%, 82.67% of the total biomass in the mobile, semi-stable and stable dunes and grassland respectively. The biomass, total C and N of annuals and C3 plants in the stable dune were higher than in the other habitats. In semi-stable and stable dunes and grassland, the C %, total C and N of C3 plants were higher than those of C4 plants. The results indicate that total biomass, C and N increase gradually during sand dune stabilization. Plants on the stable dune had greater potential to sequester C and N, mostly contributed by annuals and C3 species. The C3 species also provided an important buffer against the decrease in C4 plant biomass during the sand dune stabilization process.

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