中国农业科学 ›› 2022, Vol. 55 ›› Issue (19): 3862-3874.doi: 10.3864/j.issn.0578-1752.2022.19.015
• 畜牧·兽医 • 上一篇
收稿日期:
2021-04-30
接受日期:
2022-07-28
出版日期:
2022-10-01
发布日期:
2022-10-10
通讯作者:
宋孝玉
作者简介:
胡志强,E-mail: 基金资助:
HU ZhiQiang(),SONG XiaoYu(
),QIN Lin,LIU Hui
Received:
2021-04-30
Accepted:
2022-07-28
Online:
2022-10-01
Published:
2022-10-10
Contact:
XiaoYu SONG
摘要:
【目的】保护中国高寒荒漠草原的生态环境,指导草原牧区的全面可持续发展,从草畜平衡的角度为制定高寒荒漠草原牧区合理的放牧管理政策及实现牧草资源高效利用提供依据。【方法】根据季节性轮牧的特点和牲畜生产节律,考虑了草地资源的时空隔离和牲畜数量的动态变化,对暖季、冷季两个草场放牧时间段进行细化,在现有合理载畜量计算方法的基础上,以载畜量最大为目标,以动态草畜平衡为约束条件,以转场时间和出栏率为优化参数,建立了放牧-管理优化模型,并选取青海省乌兰县牧区作为高寒荒漠草原季节性牧区的典型代表,利用遗传算法寻优,确定乌兰县牧区丰、平、枯3种降水情景下最优放牧条件,进行草畜平衡优化模拟计算和动态草畜平衡分析,并与优化前进行对比。【结果】放牧-管理优化模型对牧区不同降水情景的模拟结果均较好。以未利用饲草量最低为依据,确定乌兰县牧区丰、平、枯3种降水情景下最优放牧条件分别为11月1日转场,出栏率43.4%、11月3日转场,出栏率38.2%和11月3日转场,出栏率36.7%,最优合理载畜量分别为109.92、96.14和83.64万标准羊单位,较优化前合理载畜量分别提高了11.75%、10.44%和10.43%;优化前后乌兰县牧区丰水年的合理载畜量分别为98.38和109.92万标准羊单位,比枯水年的75.74和83.64万标准羊单位的适宜承载量高30%,可见除牲畜出栏率和转场时间外,降水量也是影响牧区合理载畜量的重要因素;通过对牧区产草过程与牲畜动态需草过程的分析,进行乌兰县牧区平水年动态草畜平衡计算后发现,优化前冷季牧场可利用饲草不能被完全利用,放牧过程存在不合理之处,剩余草量超过6 130万kg,而优化后可利用饲草未充分利用问题得到有效解决,牧草资源得到高效利用,对于乌兰县整个牧区而言,调整放牧转场时间和牲畜出栏率是改良放牧制度的可靠方式;利用放牧-管理优化模型对牧区放牧过程进行优化,可以在保证牧区全年合理载畜量较高的同时,能够实现季节性轮牧区动态草畜平衡。【结论】放牧-管理优化模型对高寒荒漠草原季节性牧区的适用性较好,对轮牧区放牧管理过程调控和草畜平衡优化具有一定的优越性;放牧-管理优化模型可有效调控牧区载畜量,其优化结果可为制定合理的放牧制度提供参考,因此可将该模型用于优化单个牧户或牧场的放牧过程,得到单个牧户或牧场的最优放牧条件,从而制定相应的放牧制度,对单个牧户或牧场的生产实践工作更具有实际指导意义和可操作性。
胡志强,宋孝玉,覃琳,刘辉. 高寒荒漠草原季节性放牧管理优化模拟研究[J]. 中国农业科学, 2022, 55(19): 3862-3874.
HU ZhiQiang,SONG XiaoYu,QIN Lin,LIU Hui. Study on Seasonal Grazing Management Optimal Model in Alpine Desert Steppe[J]. Scientia Agricultura Sinica, 2022, 55(19): 3862-3874.
表1
乌兰县牧区草地资源现状"
牧区 Pasturing area | 暖季牧场 Warm season meadow | 冷季牧场 Cold season meadow | 人工草地 Artificial meadow | |||
---|---|---|---|---|---|---|
面积 Area (104hm2) | 干草生产力 Grassland productivity (kg·hm-2) | 面积 Area (104hm2) | 干草生产力 Grassland productivity (kg·hm-2) | 面积 Area (hm2) | 利用方式 Utilization method | |
希赛盆地 Xisai basin | 17.4 | 1378.0 | 23.6 | 1383.2 | 1128.0 | 冷季补饲 Cold season supplementary feeding |
茶卡盆地Chaka basin | 3.5 | 1354.3 | 4.7 | 1384.3 | 405.3 | |
合计 Total | 17.0 | 1354.3 | 20.3 | 1384.3 | 1533.3 |
表2
不同降水情景下天然草地和人工草地可利用产草量"
牧区 Pasturing area | 降水频率 Rainfall frequency (%) | 暖季牧场 Warm season meadow (104kg) | 冷季牧场 Cold season meadow (104kg) | 人工草地 Artificial meadow (104kg) | 合计 Total (104kg) |
---|---|---|---|---|---|
希赛盆地 Xisai basin | 25 | 20321 | 29509 | 1218 | 51048 |
50 | 17983 | 26115 | 45316 | ||
75 | 15646 | 22719 | 39583 | ||
茶卡盆地 Chaka basin | 25 | 4019 | 5879 | 438 | 10336 |
50 | 3555 | 5202 | 9195 | ||
75 | 3093 | 4525 | 8056 | ||
合计 Total | 25 | 24340 | 35388 | 1656 | 61384 |
50 | 21538 | 31317 | 54511 | ||
75 | 18739 | 27244 | 47639 |
表3
不同降水频率下模型优化结果"
降水频率 Rainfall frequency (%) | 序号 Serial number | X1 (d) | X2 (%) | A (104 sheep unit) | 未利用饲草量 Unutilized forage (104kg) | 合理载畜量偏差计算 Carrying capacity deviation calculation (%) | |
---|---|---|---|---|---|---|---|
25 | 优化前Before optimization | 21 | 45.33 | 98.38 | 6742.8 | \ | |
优化后 Optimized | ① | 0 | 43.40 | 109.92 | 2.8 | 11.75 | |
② | 1 | 41.40 | 109.29 | 3.0 | 11.11 | ||
③ | 2 | 39.40 | 108.65 | 3.3 | 10.46 | ||
④ | 3 | 37.40 | 108.00 | 3.5 | 9.80 | ||
50 | 优化前Before optimization | 21 | 45.33 | 87.05 | 6160.0 | \ | |
优化后 Optimized | ① | 0 | 42.20 | 97.28 | 3.1 | 11.75 | |
② | 1 | 40.20 | 96.72 | 1.3 | 11.11 | ||
③ | 2 | 38.20 | 96.14 | 0.4 | 10.44 | ||
④ | 3 | 36.20 | 95.56 | 1.6 | 9.78 | ||
75 | 优化前Before optimization | 21 | 45.33 | 75.74 | 5571.6 | \ | |
优化后 Optimized | ① | 0 | 40.60 | 84.62 | 3.8 | 11.72 | |
② | 1 | 38.70 | 84.15 | 4.7 | 11.10 | ||
③ | 2 | 36.70 | 83.64 | 1.2 | 10.43 |
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