Economic Importance of Bryophytes - Evolution of Plants - Lecture Slides, Slides for Evolution. Shree Ram Swarup College of Engineering & Management


Description: Economic Importance of Bryophytes, Liverworts and Hornworts, Glomeromycota, Sphagnidae, Sphagnum Dressings, Important in Hydrodynamics, Bog Formation, Sphagnum Ion-Exchange Mechanism are the important key points of lecture slides of Evolution of Plants.

Economic Importance of Bryophytes I. Liverworts and hornworts: not much! (but many contain Nfixing cyanobacteria, important in ecosystem nutrient availability; some are mycorrhizal with Glomeromycota) II. SPHAGNIDAE: "economic" importance • 1. Important in hydrodynamics of large areas of especially northern hemisphere - bogs and “muskeg”. • 2. Sphagnum dressings, in medicine, shoes and diapers • III. Other mosses, various other uses BOG FORMATION • a) open pond, slow-moving stream: margins with floating aquatics, especially Carex spp. with roots anchored in Sphagnum • b) Sphagnum builds above (growth) and below (death and deposition) water-line; enables margin to grow inwards • c) increased Sphagnum growth allows colonization of mat by bog shrubs, and eventually conifers such as black spruce & tamarack Bog Formation II • d) continued encroachment of water surface by floating bog mat may eventually cover surface if disturbance is slight. Waves or stream-flow erode edges • e) amelioration of water table by increased Sphagnum mat away from water-line allows development of forest; hummocks may have white pine or white birch • f) in permafrost areas, forest lowers summer temperature of forest floor, permafrost moves upward, water is trapped, and trees are drowned, so open Sphagnum bog cycles with forest SPHAGNUM ION-EXCHANGE MECHANISM • Metal2+ + 2HA ---> MA+ + A- + 2H+ • Gives off H+, lowering pH and eliminating competing mosses (and many vascular plants) • Metal ions can be displaced by shaking in H+ (e.g., dilute HCl) to assay metal content BOG SIDE-BENEFITS a) b) Bog fossils PEAT (1.5m = 6,000y): for fuel and horticulture c) Conservation aspects: exploitations and emissions d) Carbon sink – unless climate warms! Sphagnum dressings, in medicine, shoes and diapers • Absorbs 16-20 X dry weight in water (cotton 4-6); comfortable; mildly antiseptic (vs diaper rash, g

Download original document

angrene) • Sphagnum dressing used greatly in wars: Russo-Japanese (19045); WW I (both sides). Millions of dressings made by thousands of volunteers a) crude sphagnum collected, partially air-dried, cleaned of debris, and sorted. b) wrapped in sewn gauze c) sterilized before use by autoclaving or with antiseptics d) preferred species was S. papillosum; also used were S. palustre, S. imbricatum & S. magellanicum III. Other Mosses, Other Uses: 1. Housing 2. Boat-building 3. Fibre for baskets 4. Bedding and pillows 5. Cultivation 6. Mosses as living mulch in nurseries and orchards 7. Problem mosses in lawns and roofs

Document information
Uploaded by: raaj
Views: 3148
Downloads : 0
University: Shree Ram Swarup College of Engineering & Management
Subject: Evolution
Docsity is not optimized for the browser you're using. In order to have a better experience please switch to Google Chrome, Firefox, Internet Explorer 9+ or Safari! Download Google Chrome