湖南不同季别稻作系统的生态能值分析

周江,向平安

Ecological Emergy Analysis of Different Paddy Ecosystems in Hunan Province

ZHOU Jiang,XIANG PingAn

表6 2002—2016年湖南稻田生态系统的利润率（%）

Table 6 Profit rate (%) of rice ecosystem in Hunan Province from 2002 to 2016

年份 Year 成本-收益分析法 Cost-benefit analysis method 能值分析法（只计算购买能值） Emergy analysis method (only calculating purchasing emergy) 能值分析法（含自然资源能值） Emergy analysis (including natural resources emergy) 早稻 Early rice 中稻 Semilate rice 晚稻 Late rice 早稻 Early rice 中稻 Semilate rice 晚稻 Late rice 早稻 Early rice 中稻 Semilate rice 晚稻 Late rice 2002 -11.38 31.12 11.97 51.84 150.70 119.45 22.76 95.68 82.76 2004 40.77 100.78 69.37 123.38 243.90 161.95 85.34 180.61 136.05 2006 22.30 37.53 45.88 116.74 149.33 158.85 81.77 108.05 129.85 2008 25.91 44.74 41.88 119.42 159.16 158.00 92.97 121.92 129.37 2010 9.37 40.79 43.70 95.54 161.71 139.28 63.39 112.52 112.26 2012 21.78 33.06 28.49 110.49 151.13 143.48 76.79 109.97 117.33 2014 7.71 14.82 19.22 101.64 140.61 136.75 77.29 108.53 109.24 2016 -1.87 24.26 12.41 107.39 185.82 149.64 68.55 134.18 115.26