CAJ | 학술논문

耕地具有重要的生态价值,但难以定量评价.低山丘陵是中国土地整治的重要区域,整治前后耕地生态价值发生变化.该文以山东省莱芜市里辛土地整治项目为例,基于生态服务价值评价理论,采用替代法、市场定价法等方法,探讨了低山丘陵土地整治区耕地生态价值评价方法及整理前后耕地生态价值变化.结果表明,研究区耕地气体调节、营养循环、水源涵养和土壤保持4种生态服务功能的整理前后总价值分别为428.61和774.90万元,耕地具有较高的生态价值,其中气体调节价值最大.整理后耕地生态价值比整理前增加346.29万元,增值率80.79%,土地整理生态效益显著,其中气体调节价值增加最多.该研究方法对耕地生态价值定量评价有借鉴意义,评价结果可为莱芜市里辛土地整理绩效评价提供科学依据.
경지구유중요적생태개치,단난이정량평개.저산구릉시중국토지정치적중요구역,정치전후경지생태개치발생변화.해문이산동성래무시리신토지정치항목위례,기우생태복무개치평개이론,채용체대법、시장정개법등방법,탐토료저산구릉토지정치구경지생태개치평개방법급정리전후경지생태개치변화.결과표명,연구구경지기체조절、영양순배、수원함양화토양보지4충생태복무공능적정리전후총개치분별위428.61화774.90만원,경지구유교고적생태개치,기중기체조절개치최대.정리후경지생태개치비정리전증가346.29만원,증치솔80.79%,토지정리생태효익현저,기중기체조절개치증가최다.해연구방법대경지생태개치정량평개유차감의의,평개결과가위래무시리신토지정리적효평개제공과학의거.
@@@@Arable land not only has important agricultural production function and economic value, but also has ecological function and value, such as gas regulation, nutrient cycling, water conservation, soil conservation etc. But it is difficult to have quantitative evaluation on it. Low hills are important land consolidation areas in China, engineering and biological measures taken during land consolidation change the arable land area, soil properties, terrain slopes, irrigation conditions etc, which leads to changes in the ecological value of arable land in project area. Taking the Lixin land consolidation project of Laiwu city in Shandong province as an example, based on the ecological service value evaluation theory, the evaluation methods of arable land ecological value was proposed, the four ecological service values were calculated, including gas regulation, nutrient cycling, water conservation and soil conservation, and their values before land consolidation in low hilly region were compared with those after land consolidation in this paper. @@@@Gas regulation value was estimated by using carbon sequestration-oxygen making of crop and the substitution method. Before land consolidation, when the study area had no irrigation, peanuts were planting outdoors, biomass was lower, gas regulation value was 2.1848 million Yuan. After land consolidation, gas regulation value was 4.9441 million Yuan, the increase was 2.7593 million Yuan for production conditions improvement, mulching planting peanuts and biomass substantial increase. Nutrient recycling value was estimated by using soil pool nutrient cycling and market pricing method. After land consolidation, arable land area and soil thickness increased significantly, soil bulk density decreased and soil nutrient content decreased slightly. Nutrient cycling value was 1.3082 and 1.5855 million Yuan before and after land consolidation respectively, the increase was 277,300 Yuan after land consolidation. Water conservation value was estimated by using water conservation and market pricing method. For the study area was mainly sandy loam and lack of irrigation facilities, water conservation value was 88,900 Yuan before land consolidation. After land consolidation, water conservation value was 425,600 Yuan, and the increase was 336,700 Yuan for soil texture was slightly improved and new water storage facilities were built. Soil conservation value was estimated by using the amount of soil nutrients remains and market pricing method. The study area was hilly area, so range of terrain slopes were relatively large. Taking different measures, such as land leveling, setting up the sloping terrace, etc., the soil erosion was reduced and soil nutrients were maintained. The amount of potential soil erosion, realistic soil erosion and soil conservation were measured with universal soil loss equation (USLE) before land consolidation, then soil conservation value were obtained, which were 704,200 Yuan. The same method was used to calculate the soil conservation value after land consolidation, the value was 793,600 Yuan. @@@@The total ecological value, which was equal to the sum of gas regulation, nutrient cycling, water conservation and soil conservation was 4.3132 and 7.8103 million Yuan before and after land consolidation. The results showed that arable land had higher ecological value and among them, gas regulation value was the maximum. The arable land ecological value increased 3.4971 million Yuan and its growth rate was 81.03%after land consolidation, so the ecological benefit of land consolidation was prominent. The evaluation method provides a reference for arable land ecological evaluation, and the evaluation results provide a scientific basis for performance evaluation of land consolidation project in Lixin of Laiwu city.