甸草原光合有效辐射分量变化规律分析

草业学报 ›› 2010, Vol. 19 ›› Issue (4): 243-250.

甸草原光合有效辐射分量变化规律分析

李瑾^1,2,张德罡¹,张宏斌^2,3,4,李刚⁴,杨桂霞^2,3,4,李林芝^1,2,辛晓平^2,3,4*

1.甘肃农业大学草业学院,甘肃兰州 730070;
2.呼伦贝尔草原生态系统国家野外科学观测研究站,北京 100081;
3.农业部
资源遥感与数字农业重点开放实验室,北京 100081;
4.中国农业科学院农业资源与农业区划研究所,北京 100081

收稿日期:2009-08-21 出版日期:2010-08-20 发布日期:2010-08-20
作者简介:李瑾(1983-),女,甘肃临洮人,在读硕士。E-mailxiaohutu217@163.com.cn
基金资助:
中央级公益性科研院所专项资金,国家重点基础研究发展规划项目(2007CB106806),国家自然科学基金面上项目(30770327),国家高技术研究发展计划项目(2007AA10Z230)和国家科技支撑计划项目(2006BAC08B0404、2007BAC03A10)资助。

A study on the variations of pivotal photosynthetic active radiation parameters of a Leymus chinensis meadow-steppe in Hulunber

LI Jin^1,2, ZHANG De-gang¹, ZHANG Hong-bin^2,3,4, LI Gang⁴, YANG Gui-xia^2,3,4, LI Lin-zhi^1,2, XIN Xiao-ping^2,3,4

1.College of Pratacultural Science, Gansu Agricultural University, Lanzhou 730070, China;
2.Hulunber
State Station of Grassland Ecosystem Field Observation and Scientific Research, Beijing 100081,
China;
3.Key Laboratory of Resources Remote Sensing and Digital Agriculture, Ministry of
Agriculture, Beijing 100081, China;
4.Institute of Agricultural Resources and Regional
Planning of Chinese Academy of Agricultural Sciences, Beijing 100081, China

Received:2009-08-21 Online:2010-08-20 Published:2010-08-20

摘要/Abstract

摘要： 通过实测呼伦贝尔羊草草原冠层光合有效辐射(PAR)各分量并计算冠层反射率、土壤反射率,对其季节变化、日变化进行浅析。研究表明,在生长季6月初-9月下旬,PAR和APAR(吸收性光合有效辐射)季节变化均呈减小趋势。PAR波动较大,在25～58mol/m²;APAR则在17～34mol/m²波动。光合有效辐射吸收比例(FPAR)随季节推移呈增大趋势,波动范围在0.46～0.77,最大值出现在8月下旬,可达0.77。晴天冠层入射PAR、反射PAR、透射PAR和土壤反射PAR日变化均呈较标准正弦曲线。冠层反射率在中午12点前后最低而早晚值较高。土壤反射率日变化6月波动较大,在0.4之内,7-9月,仅在0.08内。APAR日变化趋势和入射PAR基本一致。6月、7月至8月中旬,晴天FPAR日变化呈较标准的余弦曲线,变动幅度为0.60,9月变动幅度仅为0.13,几乎趋于常数。本研究在获取较准确地面实测PAR数据的同时得到FPAR,可为本地区草地FPAR的精度评估和验证提供参考。

Abstract: The diurnal and seasonal variations of photosynthetic active radiation (PAR) parameters, the calculation of reflectance of canopy and transmittance of soil in a Leymus chinensis meadow-steppe in Hulunber were studied. The seasonal variations of both PAR and absorbed photosynthesis active radiation (APAR) tended to decrease in the growth period from early June to late September. PAR fluctuated over a wider range (25 and 58 mol/m²) than APAR (17 and 34 mol/m²). However, the fraction of photosynthetic active radiation (FPAR) tended to increase during the season. It fluctuated between 0.46 and 0.77 with the highest FPAR value of 0.77 in the last ten days of August. Changes of incident PAR, reflectance PAR, and transmittance PAR of the canopy and the soil reflectance PAR during clear days were standard sine curves. The diurnal variation of canopy reflectance ratio was highest in the morning and evening but lowest around 12:00 noon. The diurnal change (0.4) of the reflectance ratio of soil varied over a wider range in June than in July and September (0.08). The diurnal variation of APAR was identical with the incident PAR. The diurnal FPAR variation was a curve of cosine on clear days in June, July, and the middle of August, with a variation of 0.60, compared with a variation of only 0.13 in September. The relative correct PAR data were obtained by measuring on the ground as well as FPAR and it provided a reference for the evaluation of precision and validation of FPAR in grassland.

中图分类号:

Q945.11
S812

李瑾,张德罡,张宏斌,李刚,杨桂霞,李林芝,辛晓平. 甸草原光合有效辐射分量变化规律分析[J]. 草业学报, 2010, 19(4): 243-250.

LI Jin, ZHANG De-gang, ZHANG Hong-bin, LI Gang, YANG Gui-xia, LI Lin-zhi, XIN Xiao-ping. A study on the variations of pivotal photosynthetic active radiation parameters of a Leymus chinensis meadow-steppe in Hulunber[J]. Acta Prataculturae Sinica, 2010, 19(4): 243-250.

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