LANDSCAPE ECOLOGY SREM 3011 LECTURE 6 Dr Brendan Mackey Department of Geography The Australian National University
LANDSCAPE ECOLOGY SREM 3011 LECTURE 6 Dr Brendan Mackey Department of Geography The Australian National University
(1)Physiognomy, (2) life forms, 3 growth forms and(4)structure vary in a predictable way with climate and other environmental variables related to the growth of a plant 1. Net photosynthesis of foliage canopy 2. Structural support 3. Water/nutrient delivery network 4. Reproduction Respiration Translocation/storage of photosynthates 1,4,3 2,3 2,3,4
• (1) Physiognomy, (2) life forms, (3) growth forms and (4) structure - vary in a predictable way with climate and other environmental variables - related to the growth of a plant 1. Net photosynthesis of foliage canopy 2. Structural support 3. Water/nutrient delivery network 4. Reproduction Respiration Translocation/storage of photosynthates 1, 4, 3 2, 3 2, 3, 4
Plant Life Cycle Germination Growth 一 Reproduction Death Annual growth cycle Perrenial sexual vegetative
Plant Life Cycle Germination Growth Reproduction Death • Annual growth cycle • Perrenial sexual vegetative
Optimum ranges for environmental factors at each stage Temperature fluidity Spore germination D21.5 Liquid2O):5.1-6.3:0-1600 Growth of protonema D)17.s1)26.3 Liquid15.1-5810 Nl3.8N20.8 Production of buds D17S126.3 N13.SN20.8 Growth of shoot .Dl78D2.3 100 5).1-5.S N13.8N20.8 Production of sex organs Fertilization I Liquid 11.0 Growth of sporophyte Production of spores Production of gemmae D17.8)21.5 100 (100 N3.8N106.9 Gemma germination D19.9D23.5 Liquid I4)3.04i.5{30-1000 N172N20.7
Optimum ranges for environmental factors at each stage
Temperature controls on plant growth 1. Shoot growth 2. Stem/trunk growth Initiation and rate of 3. Leaf initiation/expansion growth etc is tem perature controlled 4. Root growth In colder climates, eg Boreal, temperature activates/ closes 'active cycle'ie plant 'shuts down'in between Eg. start growing season 5 days where MDT >5C end growing season MINT <2C Growing degree days accumulated temperature sum above a base temp erature
Temperature controls on plant growth: 1. Shoot growth 2. Stem/trunk growth 3. Leaf initiation/expansion 4. Root growth • In colder climates, eg. Boreal, temperature activates/ closes ‘active cycle’ ie. plant ‘shuts down’ in between Eg. start growing season 5 days where MDT >50C end growing season MINT <20C • Growing degree days - accumulated temperature sum above a base temperature Initiation and rate of growth etc. is temperature controlled