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西藏高原种养废弃物资源特征、利用瓶颈与循环发展对策

Resource characteristics, utilization bottlenecks, and circular development pathways of crop-livestock waste on the tibetan plateau

  • 摘要: 针对西藏高原农业废弃物资源本底不清、利用效率低、种养循环脱节等问题,系统评估了区域种养废弃物资源量、利用潜力与循环路径,以支撑农牧业绿色高质量发展。基于草谷比法和产排污系数法,核算了2023年西藏主要农作物秸秆与畜禽粪污产生量、养分总量及时空分布,结合土地承载力分析与区域农业农村生产生活特征,评估其肥料化、饲料化与能源化潜力。结果表明,西藏秸秆年产生量176.49万t,综合利用率97.09%,以粗饲料直接饲喂为主;畜禽粪污年产生量5 041.13万t,综合利用率达92%以上,以户用炊事取暖燃料与简单堆沤还田为主。两者富含氮磷钾等养分,具备替代和减控化肥的潜力。然而,受高寒气候制约,现有转化技术水平不高,养分循环利用率偏低、技术集成不足,尚未形成系统闭环。亟需构建分区协同处理农业废弃物的种养循环模式,研发适配高原地区的快速堆肥、饲料调制、清洁能源等集成技术,推动废弃物从低效处理向高质量循环利用转型,为西藏农牧业生态保护与产业升级提供路径支撑。

     

    Abstract: As a crucial ecological security barrier and an important region for characteristic agriculture and animal husbandry in China, the Tibet Plateau faces challenges including an imbalance between forage supply and livestock demand, relatively low farmland quality, and inefficient utilization of agricultural waste resources. To promote the coordinated development of ecological protection and agriculture production, this study evaluated the resource availability and recycling potential of crop straw and livestock manure in Tibet. Taking 2023 as the baseline year, the production amounts, spatial distribution, and nutrient characteristics of major crop straw recourses (including highland barley, wheat, and rapeseed straw.) and livestock manure (including cattle, sheep, and pig manure.) were systematically assessed based on the Technical Specification for Investigating and Evaluating Crop Straw Resources (NY/T 1701-2009) and the Manual of Pollution Production and Discharge Coefficients for Livestock and Poultry Manure. The straw-to-grain ratio, land carrying capacity, and nutrient equivalent methods were applied. In addition, field surveys and literature analysis were used to identify the current utilization patterns, problems, and recycling potential of straw and manure as fertilizer, feed, and energy resources. The results showed that: 1) In 2023, the theoretical amount of straw resources in Tibet reached 1.7649 million tons, with highland barley straw accounted for 74.56%. Straw resources mainly concentrated in Shigatse City. The total amount of livestock manure reached 50.4113 million tons, dominated by cattle manure, with the highest production concentrated in Nagqu City and Qamdo City. 2) The comprehensive utilization rates of straw and livestock manure reached approximately 97.09% and more than 92%, respectively. However, straw utilization was mainly based on direct feeding, while manure was primarily managed through dry manure combustion and simple composting, resulting in relatively low nutrient recovery efficiency and substantial losses of nitrogen and phosphorus. 3) The alpine, low-pressure, and hypoxic environment of the plateau restricts waste decomposition and limits the applicability of conventional recycling technologies. Moreover, the connection between crop production and livestock farming remains weak, preventing the formation of an effective planting-breeding-waste recycling loop. (4) Differentiated recycling models should be developed according to regional resource endowments and climatic conditions, including planting-breeding-feeding cycles in southeastern Tibet, integrated energy-fertilizer utilization in central Tibet, and forage-livestock-manure cycles in northwestern Tibet. Regional collaborative utilization networks should be established by improving waste collection, storage, and transportation and developing low-temperature composting, feed processing, and distributed energy conversion technologies. These measures can improve nutrient recycling, alleviate forage shortages, reduce agricultural non-point source pollution, and facilitate the green and low-carbon development of agriculture and animal husbandry in the Tibet Plateau.

     

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