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nitrogen storage and allocation in China’s forest ecosystems

Science China Earth Sciences 2020年第10期63卷 1475-1484页

作者： Li XU Nianpeng HE Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Forests are important parts of terrestrial ecosystems and play a leading role in regional and global nitrogen(N)cycles.Detailed assessment of N storage and allocation in China’s forests is critical to improve the accuracy of regional or global N estimates and to guide policy-makers in the formulation of scientific and effective N management measures.However,the fore stN storage at national scale remains unclear.Based on 4420 forest field-investigated data,we investigated the N storage allocation in China’s forests,explored the spatial patterns and influence factors.The data included vegetation information on various organs(i.e.,leaf,branch,stem,and root)and soil information at different depths(0-30 cm and 0-100 cm).The total N storage in China’s forest ecosystems was 14.45±8.42 tN hm^–2;0.86±0.51 tN hm^–2(5.95%)in vegetation and 13.59±8.40 tN hm^–2(94.05%)in soil(0–100 cm).The storage and allocation of N varied significantly across various regions and forest types.For different ecological regions,N storage varied from 10.34 to 23.11 tN hm^–2,and the allocation ratio of N storage between vegetation and soil(0–100 cm)varied from 0.03 to 0.16.For different forest types,the N storage varied from 12.87 to 18.32 tN hm^–2,and the allocation ratio of N storage between vegetation and soil(0–100 cm)varied from 0.03 to 0.09.The spatial patterns relative to N storage and allocation in forests were different.Climate was the primary factor influencing the spatial variation in forestN storage,while soil texture was the main factor influencing the spatial variation in N allocation.These first estimates of N storage and allocation ratio in China’s forests are keys for improving the fitting accuracy of regional N cycle models and provide a reference for regional management of forestN.

关键词： Forest nitrogen cycling nitrogen storage Allocation Climate Soil nutrient Soil texture

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Poplar Trees （Populus canadensis Moench） Initiate Vegetative storage Protein Accumulation During New Shoot Development in Spring

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Journal of Integrative Plant Biology 2005年第6期47卷 717-725页

作者： Wei-MinTIAN Shi-QingPENG Bing-ZhongHAO Ji-LinWU Zheng-HaiHU Ke-MingCUI CollegeofLifeSciences PekingUniversityBeijing100871China HainanProvincialKeyLaboratoryofCultivationPhysiologyforTropicalCrops RubberResearchInstituteChineseAcademyofTropicalAgriculturalSciencesDanzhou571737China NationalKeyBiotechnologyLaboratoryforTropicalCrops ChineseAcademyofTropicalAgriculturalSciencesHaikou571101China InstituteofBotany NorthwestUniversityXi＇an710069China

It was generally assumed that the accumulation of vegetative storage protein (VSP) in poplar trees and/or temperate hardwoods did not occur in spring. To test this assumption, the accumulation of the 32-kDa VSP and the differential expression of a gene encoding for the protein in poplars were investigated using light and electron microscopy, sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and reverse transcription-polymerase chain reaction (RT-PCR). We report, for the first time, that poplar trees initiated VSP accumulation in new shoots during the development of new shoots in spring under conditions of high temperature and long days. The amount of 32-kDa VSP increased gradually in the stem of new shoots and in two-year-old branches, but there were no detectable changes in its abundance in the bark tissues of trunks during new shoot development. Based on the presence of a 286-bp DNA fragment that is identical to the VSP gene bspA, encoding for the 32-kDa VSP in Populus deltoids Bartr. ex Marsh., the differential expression of the 32-kDa VSP gene in P. canadensis Moench was revealed by RT-PCR. The results indicated that the 32-kDa VSP gene was expressed strongly in new shoots, relative weakly in two-year-old branches and was not expressed in the trunk during new shoot development. This pattern of VSP accumulation and VSP gene space-time differential expression may be an important mechanism by which stored nitrogen compounds are used preferentially to exogenously available nitrogen and, in addition, the dynamic pattern may also have a role in the regulation of nitrogen metabolism, especially nitrogen uptake by the roots.

关键词： new shoot nitrogen storage Populus canadensis temperate hardwoods vegetative storage proteins

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