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Volume 3, Issue 2 (Suppl)
Trends in Green chem
ISSN: 2471-9889
Environmental & Green Chemistry 2017
July 24-26, 2017
Page 99
5
th
International Conference on
6
th
International Conference on
July 24-26, 2017 Rome, Italy
Environmental Chemistry and Engineering
Green Chemistry and Technology
&
Comparison of net GHG emissions between separated system and crop-swine integrated system in the
North China plain
Zhejin Li
China Agricultural University, China
A
griculture causes 10–12% of global GHG (CO
2
, CH
4
and N
2
O) emissions. GHG emissions from Chinese agriculture have
been estimated at 819.97 Mt CO
2
-equivalence (CO
2
-eq); among them, total annual GHG emissions from the production
of grain and livestock have been estimated at 374 Mt CO
2
-eq and 445 Mt CO
2
-eq, respectively. Because of food demand, food
production has intensified, resulting in the separation of crop production and livestock rearing. This separation has increased
the application of outside resources and agricultural waste, aggravating GHG emissions and other ecological and environmental
problems. This research attempts to mitigate GHG emissions by improving soil carbon sequestration of crop production and
decreasing emissions from swine-rearing waste. Net GHG emissions (NGHGE) between an integrated system and a separated
system are compared in this study from a life-cycle perspective. The causes of different GHG emissions between these two
systems are analyzed and mitigation strategies are proposed. The results show that the NGHGE of crop-swine integrated
and separated systems were 24917.95 kg CO
2
-eq/ha/yr and 27732.70 kg CO
2
-eq/ha/yr, respectively, for 215 head of pigs. The
integrated system reduced GHG by 1381.33 kg CO
2
-eq/yr mainly due to the recycling and reuse of pig manure in croplands.
Meanwhile, the integrated system increased soil carbon storage by 35.92% compared with the separated system, although it
increased soil CH
4
and N
2
O emissions. In conclusion, these results indicate that through a series of methods, such as recycling
agricultural waste, the integrated system can reduce net GHG emissions by 10.15% compared with separated systems. Although
much work remains to adopt the integrated system to reduce GHG emissions, the crop-swine integrated system should be
given priority to mitigate anthropogenic net GHG emissions.
Biography
Zhejin Li is a student of China Agricultural University pursuing Doctoral degree. Her major is Agricultural Wastes Managements and Ecological Agriculture.
lizhejincau@163.comZhejin Li, Trends in Green chem, 3:2
DOI: 10.21767/2471-9889-C1-003