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| Comparison of leaf biomass of Populus alba var. pyramidalis in different time and space under farmland shelterbelt in Dengkou county |
| ZHAO Yingming1,2, CHU Yang3, ZHANG Jiaqi4, HUANG Yaru1, MA Yingbin1, TANG Jinnian5, HAO Yuguang1, LIU Minghu1 |
1. Experimental Center of Desert Forestry, Chinese Academy of Forestry/Inner Mongolia Dengkou Desert Ecosystem Research Station, State Forestry and Grassland Administration/National Long Term Scientific Research Base for Comprehensive Control of Ulan Buh Desert, 015200, Dengkou, Inner Mongolia, China;
2. Institute of Desertification Studies, Chinese Academy of Forestry, 100091, Beijing, China;
3. Experimental Centre of Forestry in North China, Chinese Academy of Forestry, 102300, Beijing, China;
4. School of Aviation, Inner Mongolia University of Technology, 010051, Hohhot, China;
5. Gansu Desert Control of Institute, 730070, Lanzhou, China |
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Abstract [Background] Leaf is the only organ that can carry out photosynthesis in most trees, and its biomass research plays an important role in absorbing CO2, curbing global climate change and dust retention. However, the study of leaf biomass, especially for deciduous broad-leaved trees, mostly focuses on the annual leaf biomass, and then compares it with other organ biomass at different time scales, which leads to the lack of scientific results. At present, there is no calculation method of multi-year leaf biomass, which brings inconvenience to the comparative study of leaf biomass of broad-leaved tree species and the calculation of leaf carbon pool accumulation. In order to obtain the multi-year leaf biomass and its calculation method, and compare its difference with the annual leaf biomass, this study was carried out.[Methods] Taking Populus alba var. pyramidalis farmland shelterbelt in Ulan Buh Desert oasis as the research object, using the method of space instead of time, the annual leaf biomass model of 20 individual trees of different diameter classes was investigated on the spot, and the tree-age and corresponding DBH were brought into the annual leaf biomass model by stem analysis, and the multi-year leaf biomass was obtained and modeled, and then the leaf biomass of the forest belt and forest net were obtained, and the difference of annual and multi-year leaf biomass in different time and space was compared.[Results] The annual leaf biomass of single young forest was (1.112 8±0.628 6) kg, which increased by 5.0 times, 1.7 times and 2.5 times respectively in half-mature age forest, near mature forest and mature forest. The multi-year leaf biomass of young forest was 2.013 3 kg, which increased by 6.1 times, 4.7 times and 3.0 times respectively in half-mature, near mature and mature forest, respectively. Ratio of multi-year leaf biomass to annual leaf biomass of young, half-mature, near mature and mature forests were 182.54%, 323.10%, 436.21% and 515.79%, respectively. Fourteen annual and multi-year leaf biomass models, all of which were significant or extremely significant, were constructed.[Conclusions] The annual and multi-year leaf biomass and net productivity show an increasing trend with the increase of space-time scale; the multi-year leaf biomass is far greater than the annual average, and the gap become larger and larger with the enlargement of space-time scale; when the density is in the range of 68-205 plants/hm2, the four forest belts will grow well, and the annual and multi-year leaf biomass and net productivity increase with the increase of afforestation density.
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Received: 31 December 2019
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