Research on Ecological Environmental Carrying Capacity in Yellow River Delta

AbstractThe Yellow River Delta was selected as study area in this paper. Based on a comprehensive analysis of environmental capacity theory, environmental carrying capacity was studied using ecological footprint model, combining with the economic and social data of the Yellow River Delta from 2001-2008. The results showed that the ecological footprint per capita had increased two times from 2001-2008, which was from 0.1885 hm2 in 2001 to 0.4639 hm2 in 2008. The diversity of ecological footprint had changed slightly, and the ratio of biotic resources requirement was largest among all the other types. The development ability of ecosystem had a little improved. Environmental carrying capacity of the Yellow River Delta had increased. But compared to the increasing of ecological footprint, the increasing degree was not notable, and the ecological deficit increased obviously. The unsustainable development has already appeared from the analysis of ecological footprint index. Finally, some countermeasures were advanced in order to improve the environment situation of the Yellow River Delta, such as adjusting industrial structure through developing circulate economy vigorously, saving mine resources and protecting pasture environment through strengthening management, controlling the population and advocating sustainable life style

Typha latifolia paludiculture effectively improves water quality and reduces greenhouse gas emissions in rewetted peatlands

Paludiculture, the cultivation of crops on wet or rewetted agricultural peatlands, sustainably integrates productive land use with the provision of multiple ecosystem services. Paludiculture crops thrive under waterlogged conditions that stimulate nitrogen (N) and phosphorus (P) removal from soil and water and convert serious drainage-induced carbon (C) losses to C sequestration. Nutrient uptake by paludicrops can prevent mobilisation after rewetting and provide opportunities for purification of nutrient-rich water. Uncertainty remains, however, if and to what extent N loading and a subsequent increase in biomass productivity affect nutrient cycling as well as emissions of the potent greenhouse gases methane (CH4) and nitrous oxide (N2O). In this study, we use mesocosms with rewetted peat to investigate the effect of different N sources in surface water on biomass production of Typha latifolia, a typical paludiculture crop, and the emissions of CH4 and N2O. Organic (Azolla filiculoides; urea) or mineral (KNO3 ; NH4NO) N was supplied either a single time (steady state) or repeatedly (pulse) to simulate a total surface water load of 150 kg N ha(-1) . We found that N stimulated aboveground and belowground biomass production and nutrient uptake by T. latifolia. These effects were absent in Azolla treatments. Whereas after two months CH4 emissions arose to substantial amounts (> 10 mg CH4 m(-2) day(-1)) in unvegetated mesocosms loaded with organic N, they remained very low (<1 mg CH4 m(-2) day(-1)) in vegetated mesocosms, despite the labile C pool in the extensive belowground biomass and organic N loading. Overall, N2O emissions were close to zero and were only detected episodically after NO(3)(- )loading, irrespective of plant presence. Our findings support that T. latifolia as a paludicrop effectively removes various forms of N and P when harvested, and strongly mitigates CH4 emission after the rewetting of agricultural peat soils compared to unvegetated conditions

Dynamic evaluation of ecosystem service value in southern mountainous areas of Jinan based on 3 “S” technology

In this paper, change of land cover and use type was first studied through interpretation of the two images (2007 and 2018), and then, dynamic evaluation of ecological service value in Southern Mountainous Areas of Jinan was made with evaluation system and equivalent factors built by Xie GD based on Costanza’s system. The results revealed that the area of bare land and grass land decreased by 4875.48 hm2 and 55141.56 hm2 respectively, on the contrary, cultivated land, forestland and building land has increased by 26915.671 hm2, 32261.31 hm2 and 1442.16 hm2 respectively. The ecological service value showed the increasing trend generally, among of which water conservation, air regulation, land protection, recreation have increased distinctly, which can be explained that the control develop strategies had taken action actively