A study on restoration potential of degraded grassland on the Qinghai-Tibetan Plateau

doi:10.11686/cyxb2021164

Abstract

Abstract:

In recent years， the alpine grassland ecosystem on the Qinghai-Tibetan Plateau has shown an overall improvement， but some areas of grassland are still degenerating to various extents. It is very important to evaluate the grassland status and restoration potential in the Qinghai-Tibetan plateau to support policy-making relating to grassland restoration. Based on meteorological data and MODIS remote sensing images from 2001 to 2019， the Carnegie-Ames-Stanford-Approach （CASA） model and the Thornthwaite Memorial model were used to estimate values for the actual net primary productivity （NPP） and potential net primary productivity （PNPP） across the Qinghai-Tibetan Plateau. The difference between them was used to evaluate the potential benefit of grassland restoration. The main conclusions were as follows： 1） The spatial distribution of NPP over the Qinghai-Tibetan Plateau from 2001 to 2019 was a gradient from high in the southeast to low in the northwest. On the Qinghai-Tibetan Plateau， 41.0% of the grassland areas were being continuously restored， 12.7% of the grassland areas were exhibiting a stable status， and only 3.5% were exhibiting ongoing degradation. Overall， the Plateau grassland is in a state of sustainable restoration. 2） Similarly， the spatial distribution pattern of maximum potential net primary productivity（PNPP_m）in the Qinghai-Tibet Plateau from 2001 to 2019 was significantly higher in the southeast and southwest， and lower in the north. The PNPP_m of individual grassland types was typically about 1000 g C·m^-2. 3） From 2001 to 2019， the grassland recovery potential of the Qinghai-Tibet Plateau was higher in the southwest and southeast， and lower in the north. It was found that most grasslands in Shigatse， southern Ali， Aba Tibetan and Qiang Autonomous Prefecture and Gannan Tibetan Autonomous Prefecture regions have high restoration potential， so that the prospect of grassland restoration in these areas is better. The results of this study provide scientific and theoretical support for policy development relating to grassland restoration on the Qinghai-Tibet Plateau， and provide important data to guide grassland protection and ecosystem restoration on the Qinghai-Tibetan Plateau.

Key words: Qinghai-Tibetan Plateau, restoration potential, net primary productivity, potential net primary productivity, dynamic change

Rui-jing WANG, Qi-sheng FENG, Zhe-ren JIN, Jie LIU, Yu-ting ZHAO, Jing GE, Tian-gang LIANG. A study on restoration potential of degraded grassland on the Qinghai-Tibetan Plateau[J]. Acta Prataculturae Sinica, 2022, 31(6): 11-22.

Figures/Tables 12

References 25

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草地类型 Grassland type	未来趋势不确定Uncertain future trends	持续性轻微退化Persistent slight degradation	持续性显著退化Persistent significant degradation	持续性稳定不变The continuity is stable	持续性轻微改善Continuous slight improvement	持续性显著改善Continuous significant improvement
热性灌草丛Thermal shrub tussock	28.51	6.77	4.82	14.05	9.13	34.56
热性草丛Thermal tussock	10.17	1.07	0.80	3.48	3.84	74.04
暖性灌草丛Warm-temperate shrub tussock	29.89	4.03	1.41	15.54	12.41	18.98
暖性草丛Warm-temperate tussock	25.73	3.16	1.21	19.66	14.08	17.48
低地草甸Lowland meadow	6.12	1.87	1.77	24.09	8.12	53.70
山地草甸Mountain meadow	42.43	2.02	0.34	16.59	12.94	16.58
温性草甸草原Temperate meadow steppe	28.75	12.60	3.86	23.27	14.59	6.87
温性草原Temperate steppe	43.47	1.98	0.53	12.67	12.61	25.25
温性荒漠草原Temperate desert grassland	38.16	0.27	0.04	8.61	11.99	35.25
温性草原化荒漠Temperate steppe desert	45.06	0.25	0.03	7.29	8.89	29.22
温性荒漠Temperate desert	36.27	0.19	0.16	5.22	6.00	47.59
高寒草甸Alpine meadow	50.23	2.99	0.33	17.56	15.70	7.30
高寒草甸草原Alpine meadow steppe	44.78	1.16	0.28	15.48	17.86	18.78
高寒草原Alpine grassland	39.31	1.57	0.38	12.06	18.99	24.95
高寒荒漠草原Alpine desert grassland	41.55	0.29	0.08	4.84	12.23	36.83
高寒荒漠Alpine desert	45.07	0.58	0.47	5.41	9.04	34.54
沼泽Marsh	60.09	1.40	0.33	10.39	13.34	12.99
总计Total	36.21	2.48	0.99	12.72	11.87	29.11

草地类型 Grassland type	未来趋势不确定Uncertain future trends	持续性轻微退化Persistent slight degradation	持续性显著退化Persistent significant degradation	持续性稳定不变The continuity is stable	持续性轻微改善Continuous slight improvement	持续性显著改善Continuous significant improvement
热性灌草丛Thermal shrub tussock	28.51	6.77	4.82	14.05	9.13	34.56
热性草丛Thermal tussock	10.17	1.07	0.80	3.48	3.84	74.04
暖性灌草丛Warm-temperate shrub tussock	29.89	4.03	1.41	15.54	12.41	18.98
暖性草丛Warm-temperate tussock	25.73	3.16	1.21	19.66	14.08	17.48
低地草甸Lowland meadow	6.12	1.87	1.77	24.09	8.12	53.70
山地草甸Mountain meadow	42.43	2.02	0.34	16.59	12.94	16.58
温性草甸草原Temperate meadow steppe	28.75	12.60	3.86	23.27	14.59	6.87
温性草原Temperate steppe	43.47	1.98	0.53	12.67	12.61	25.25
温性荒漠草原Temperate desert grassland	38.16	0.27	0.04	8.61	11.99	35.25
温性草原化荒漠Temperate steppe desert	45.06	0.25	0.03	7.29	8.89	29.22
温性荒漠Temperate desert	36.27	0.19	0.16	5.22	6.00	47.59
高寒草甸Alpine meadow	50.23	2.99	0.33	17.56	15.70	7.30
高寒草甸草原Alpine meadow steppe	44.78	1.16	0.28	15.48	17.86	18.78
高寒草原Alpine grassland	39.31	1.57	0.38	12.06	18.99	24.95
高寒荒漠草原Alpine desert grassland	41.55	0.29	0.08	4.84	12.23	36.83
高寒荒漠Alpine desert	45.07	0.58	0.47	5.41	9.04	34.54
沼泽Marsh	60.09	1.40	0.33	10.39	13.34	12.99
总计Total	36.21	2.48	0.99	12.72	11.87	29.11

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