农业工程学报
農業工程學報
농업공정학보
2014年
4期
185-194
,共10页
曾永年%靳文凭%王慧敏%张鸿辉
曾永年%靳文憑%王慧敏%張鴻輝
증영년%근문빙%왕혜민%장홍휘
土地利用%生态%风险评价%情景模拟%景观%青海高原东部
土地利用%生態%風險評價%情景模擬%景觀%青海高原東部
토지이용%생태%풍험평개%정경모의%경관%청해고원동부
land use%ecosystems%risk assessment%scenarios simulation%landscape%eastern part of Qinghai plateau
为了研究西部大开发和退耕还林等生态工程对未来土地利用变化趋势的影响,将 Gray-Markov 模型和CLUE-S模型相结合,模拟自然情景、耕地保护情景和土地规划情景下青海高原东部农业区2020年土地利用覆盖状况,并分析3种情景下土地利用变化特征,采用景观格局指数和景观生态风险指数比较3种情景模拟结果。自然情景延续1999-2009年的发展模式,至2020年退耕还林/草633.98 km2,其他未利用地造林/草117.66 km2;耕地保护情景严格保护耕地,至2020年退耕还林/草142.00 km2,未利用地造林/草130.71km2;土地规划情景经济发展与环境保护并重,退耕还林/草444.18 km2,未利用地造林/草333.75 km2。景观格局指数和景观生态风险指数均表明土地规划情景下的模拟结果布局较合理。研究表明,新增建设用地扩张的同时加强生态保护,仍可以保证区域景观生态安全。该研究可为中国西部的土地利用规划和政策制定提供参考。
為瞭研究西部大開髮和退耕還林等生態工程對未來土地利用變化趨勢的影響,將 Gray-Markov 模型和CLUE-S模型相結閤,模擬自然情景、耕地保護情景和土地規劃情景下青海高原東部農業區2020年土地利用覆蓋狀況,併分析3種情景下土地利用變化特徵,採用景觀格跼指數和景觀生態風險指數比較3種情景模擬結果。自然情景延續1999-2009年的髮展模式,至2020年退耕還林/草633.98 km2,其他未利用地造林/草117.66 km2;耕地保護情景嚴格保護耕地,至2020年退耕還林/草142.00 km2,未利用地造林/草130.71km2;土地規劃情景經濟髮展與環境保護併重,退耕還林/草444.18 km2,未利用地造林/草333.75 km2。景觀格跼指數和景觀生態風險指數均錶明土地規劃情景下的模擬結果佈跼較閤理。研究錶明,新增建設用地擴張的同時加彊生態保護,仍可以保證區域景觀生態安全。該研究可為中國西部的土地利用規劃和政策製定提供參攷。
위료연구서부대개발화퇴경환림등생태공정대미래토지이용변화추세적영향,장 Gray-Markov 모형화CLUE-S모형상결합,모의자연정경、경지보호정경화토지규화정경하청해고원동부농업구2020년토지이용복개상황,병분석3충정경하토지이용변화특정,채용경관격국지수화경관생태풍험지수비교3충정경모의결과。자연정경연속1999-2009년적발전모식,지2020년퇴경환림/초633.98 km2,기타미이용지조림/초117.66 km2;경지보호정경엄격보호경지,지2020년퇴경환림/초142.00 km2,미이용지조림/초130.71km2;토지규화정경경제발전여배경보호병중,퇴경환림/초444.18 km2,미이용지조림/초333.75 km2。경관격국지수화경관생태풍험지수균표명토지규화정경하적모의결과포국교합리。연구표명,신증건설용지확장적동시가강생태보호,잉가이보증구역경관생태안전。해연구가위중국서부적토지이용규화화정책제정제공삼고。
West Development and a series of ecological environmental regulation projects have been carried out in West China since 1999. In order to study the effects of West Development and ecological projects on future land use change, this paper combines Gray-Markov model and CLUE-S model to simulate land use/cover change in 2020 in the Eastern part of Qinghai Plateau. The validation of the CLUE-S model is verified by comparing the predictive model to a null model, and the former is higher in agreement due to the quantity and location of the latter, while they have the same agreement due to chance. According to actual conditions in the Eastern part of Qinghai Plateau three scenarios (natural scenario, farmland protection scenario and planning scenario) are designed, then it analyzes the changes of land use and land cover in these scenarios and assesses them by landscape pattern index and landscape ecological risk index. The forecast of land structure based on Gray-Markov model show that construction land and forest increase greatly due to West Development and a series of ecological environmental regulation projects, especially in the planning scenario, while irrigation farmland and dry farmland descend in the study period from 2009 to 2020. The development mode of the natural scenario is the same as that from 1999 to 2009, and there will be 633.98km2 farmland returning to forest and grassland and 117.66km2 unused land turning into forest and grassland by 2020;the farmland protection scenario strictly protects arable land, with 142.00km2 farmland returning to forest and grassland and 130.71km2 unused land turning into forest and grassland; the planning scenario which integrates development of economic and environmental protection, will have 444.18km2 farmland returning to forest and grassland while 333.75km2 unused land for afforestation. The predictive results are assessed by four class-level indexes including number of patches (NP), percent of landscape (PLAND), largest patch index(LPI), landscape shape index(LSI), and eight landscape-level indexes comprised by NP, patch density(PD), edge density(ED), LSI, contagion(CONTAG), Shannon’s diversity index(SHDI), Shannon’s evenness index(SHEI), and aggregation index(AI). Class-level indexes indicate that woodland has the least landscape fragmentation in the planning scenario. Five of eight landscape-level indexes, containing ED, LSI, SHDI, SHEI and AI, indicate that the planning scenario is the best scenario of the three in intensive use of land. In conclusion, landscape evaluation and landscape ecological risk index show that the simulation results of the land planning scenario is reasonable. The planning scenario comprehensively coordinates the superior index, the goal of regional economic development and ecological protection, paying attention to the development of economic construction as well as the ecological environment construction, and improving or restoring the damaged ecosystem function to improve the overall productivity and stability of the landscape ecological system. Although new construction land expands strongly, strengthening ecological protection can still guarantee the regional landscape ecological security. Therefore, to 2020 the Eastern part of Qinghai plateau should continue to carry out the conversion of farmland to forest, but slightly lower than the strength during the period of 1999 to 2009.This study can provide evidence for the planning and land use policy formulation in the Western part of China.