Ecological Archives A020-019-A6

Fei Lu, Xiaoke Wang, Bing Han, Zhiyun Ouyang, Xiaonan Duan, and Hua Zheng. 2010. Net mitigation potential of straw return to Chinese cropland: estimation with a full greenhouse gas budget model. Ecological Applications 20:634–647.

Appendix F. Experimental data of the influence of straw return on CH4 emissions.

In this appendix, the experimental data of the influence of straw return on CH4 emissions are laid out in Table F1. The table contains the following information:

  1. The name of the site;
  2. The type of the non-ferment organic amendments
  3. Amount of organic amendments
  4. Dry matter fraction of the organic amendments;
  5. Dry matter in the organic amendments;
  6. CH4 emission with and without organic fertilizer;
  7. Scaling factor of organic amendments
  8. References.

For a few pairs of data, the dry matter was calculated from the amount of carbon in the organic amendments and the carbon fraction of the dry matter.

The dry matter fractions of fresh Astragalus sinicus L. and fresh wheat straw were from “Organic Fertilizers in China”. Since there were no data available for the dry matter fraction for air dried Astragalus sinicus L., 0.85 was taken for the calculation as this value was widely used for other kinds of straw in IPCC: Good Practice Guidance and Uncertainty Management in National Greenhouse Gas Inventories, pp.4.58.

A full list of the references is also given at the end of this appendix.

TABLE F1. Influence of organic amendments on CH4 emission from rice paddies.


Sites

Type of non-ferment organic amendments

Amount of organic amendments
(t)

Dry matter fraction

Dry matter in organic amendments
(t)

CH4 emission during each rice-growing season (kg CH4)

Scaling factor

References

With no OA

With OA

Changsha, Hunan

Fresh Astragalus sinicus L.

22.5

0.112

2.520

195.2

633.1

3.243

Rong et al. 2001

Fresh rice straw

15.6

0.365

5.694

399.5

1523.3

3.813

Fuyang, Zhejiang

Air dried rice straw

-

-

2.198

139.1

220.5

1.585

Wang 2001

-

-

2.198

139.1

196.5

1.413

Jurong, Jiangsu

Air dried rice straw

1.50

0.85

1.275

13.0

15.0

1.154

1.50

0.85

1.275

28.0

45.0

1.607

Fuyang, Zhejiang

Air dried  Astragalus sinicus L.

1.13

0.85

0.961

238.7

312.1

1.307

Hangzhou, Zhejiang

Air dried rice straw

-

-

1.435

189.1

279.4

1.478

Chen et al. 2002

-

-

1.435

189.1

247.7

1.310

Jurong, Jiangsu

Air dried rice straw

2.25

0.85

1.913

49.0

80.7

1.647

Cao et al. 2000

LITERATURE CITED

Cao, J., Ren, L., Wang, G., Xu, H., Cai, Z., Shen, Q. 2000. Methane emission from permeable paddy soils in Jiangsu Province. Agro-environmental Protection 19(1):10–14 (in Chinese).

Chen, W., Lu, W., Duan, B., Wassmann, R., Lantin, R. 2002. Effect of rice straw manure on methane emission in late-rice paddy fields. Acta Pedologica Sinica 39(2):170–176 (in Chinese).

Rong, X., Yuan, Z., Hu, R., Zhu, H., Huang, Y., Zhou, Q., Zhang, Y., Xiao, Y. 2001a. Effects of rice-based cropping system, organic manure and groundwater level on methane emission from rice fields. Agro-environmental Protection, 20(6):394–397 (in Chinese).

Wang, M. X. 2001. Methane Emission from Rice Fields in China. Science Press, Beijing, China. pp. 142–150.

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