3、ponentofthe1930'sagroecosystem,peasant's animalhusbandrydecreasedaspopulationpressurebecame serious;Second,traditionalagroecosystemisusuallyat N-Limitationanditation.Third,the amount of human and animalenergyinputchangedaccordingtoland scale.Households oorel
4、andhavemoreanimals,input,but smaller human's.inputandhouseholdsoore human's poallerdraughtanimal's,but difference of energy inputbete scholars,instead ofthat,productionchange is mostly a ecological change,thepopulationpressuremadepeasantusingmore human labor
5、 andlessanimalpos in Jiaxing region.HumanEcology.1986.14(1).1-14[2]E.C.Ellisand S.M.arch22.从表1中可以看出役畜的粗饲料量与精饲料量是很多的,足以与人争秸杆和粮食。尽管作物的秸杆可以在一定条件下替代牧草资源,但由人口增长所引起的燃料需求的增加,也增加了秸杆的消耗,进而减少家畜的饲料。在19世纪和20世纪初,华北平原的人口几乎达到了传统农业负载量的极限。民国时期,山东、河北的垦殖指数居全国的最高水平,分别达到48.28%和46